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# Give examples where the work done by a force is zero positive and negative

Negative work. Negative work is performed if the displacement is opposite to the direction of the Force applied. Example: Work was done the gravity on a rocket going perpendicular upwards. Zero work. When force and displacement are perpendicular to each other, or when force or displacement is zero. Example: When we hold an object and walk, the. So, work done is positive. NEGATIVE WORK: The work done is said to be negative work when force and displacement are in opposite direction. Example: When an object is thrown upwards,the force of gravity is in downward direction whereas displacement acts in upward direction. ZERO WORK: The work done is said to be zero when force and displacement. Okay I will give you some simple examples. Definition : work is displacement caused by a force. Examples: 1: Positive work. When you push a block and it moves with the direction of the push.The work is positive. 2: Negative work. When you apply br.. Give an example when the work done by a force is 1. Positive 2. Negative 3. Zero What is the effect on the KE of the system in each case 1. Positive work done- Dropping a ball, pushing a book, rolling a ball, pulling a chair 2. Negative work done- Throwing a ball, Applying breaks, Work done by frictional force when we push a table, Work done by buoyant force when an iron nail is sinking 3. Zero work done- When we pusha rigid wall, angle between force and displacement is 90 3.

### What is meant by a positive work, negative work and zero

1. So θ=90 degrees and cosθ=0; hence the work done by the gravitational pull is zero. In this case the gravitational pull acts like a centrifugal force. When a body revolves around in a circular path the work done by the centripetal force is always zero. (This article is on the topics Work, positive work and negative work.
2. but here also, there is no relative motion at the point of application of force. Which makes the work done still zero. But if you change the reference frame, then friction can do positive, negative, or zero work depending upon what reference frame you chose. Then the sheet example also holds good
3. Work is zero if applied force is zero (W=0 if F=0): If a block is moving on a smooth horizontal surface (frictionless), no work will be done. Note that the block may have large displacement but no work gets done. Work is zero if Cos θ is zero or θ = Π/2. this explains why no work is done by the porter in carrying the load
4. Expert Answer: (1) The work done by the frictional force, when we push the book to a distance. (2) The work done by the gravitational force, when we are lifting a bucket of water from the well. (3) The work done by the gravitational force, when we are climbing on a tree. (4) The work done by the frictional force of air, when a ball is falling.
5. Kinetic friction on the object will be acting back and on the land, it will be acting forwards. Since, there is no movement along this forward kinetic friction force, Hence, work done will be zero. Thus, Work done by the Kinetic Friction on an Object can both the Positive and Zero. Sometimes It can be negative also
6. Thereby, the work done can be a negative work done. A negative work done is work done when the force applied and displacement achieved are not in the same direction of motion. Examples of negative work done are thus as follows - a. The push of a block on a frictional surface. b. Climbing a tree against the gravitational force. c. Drowning of.

### Explain Positive, Negative and Zero Work

a) Positive work: When a ball is thrown upwards, work done by the force is positive work. b) Negative work: Work done by the gravitational force of the earth on the ball thrown which is thrown upwards. c) Zero work: Sliding of the box on the ground is an example of zero work as the gravitational force acting on the box The examples of positive, negative and zero work are as follows: (a) Positive work - When we kick a football, it moves in the direction of the force applied and hence, the work done in this case is positive For example: A coolie does work on the load when he raises it up against the force of gravity. The force exerted by coolie (=mg) and displacement, both are in upward direction. (ii) If the displacement of the body is in the direction opposite to the force, then work done is negative. Hence, W = − F × Give example of positive, negative and zero work done, one each. 2. If the net work done on a conservative system is 330 J, what would be the change in kinetic energy? Explain your answer with suitable theorem. . Question: 1. Define work done by constant and variable forces. Give example of positive, negative and zero work done, one each. 2 Positive and Negative Work. We have seen the situations when the work done is zero. Work done can also be positive or negative. When 0 o <= θ < 90 o, work done is positive as Cos θ is positive. Work done by a force is positive if the applied force has a component in the direction of the displacement. When a body is falling down, the force of. When the direction of motion of the body and the force acting on the body is opposite, work done is negative. When the force is acting at a right angle to the direction of motion of the body, work done is zero. Was this answer helpful? 3.5 (6

### When is the work done by a force negative, positive, or

• We have seen the situations when the work done is zero. Work done can also be positive or negative. When 0 o <= θ < 90 o, work done is positive as Cos θ is positive. Work done by a force is positive if the applied force has a component in the direction of the displacement
• We can say that the work done is zero in physics , 1.If displacement of any object is zero is given by,Work =Force×Displacement W=F×0=0 2.If force of any object is zero is given by, W=F×S=0×S=0 3.If force perpendicular to displacement then,Angle =..
• There are multiple conditions where work done can be zero. 1. Based on Magnitude : F=0 or D =0 or both F=D=0; Example where force is applied on the wall and wall doesn't move. D =0; 2.Based on Direction : When Desplacement is 90° from Direction of Force applied. read less
• work is only done if: 1)a force is applied on the object. 2)the object is displaced from it's initial position. NO WORK IS SAID TO BE DONE IF ANY OF THE TWO CONDITIONS IS NOT SATISFIED. while jogging, person applies force to displace his/her body. as a result, it displaces from it's initial position
• The gravitational force between two objects is an attractive force, which does positive work when the objects get closer together. Gravity does zero work (0 J) when the book moves horizontally from the shelf to the table and negative work (−20 J) when the book moves from the table back to the shelf
• When a ball is thrown with a force, it is postive work (as ball moves in direction of force applied) However, ball stops after some time (it is negative work as ball moves opposite to direction of force applied) It is because of the negative work (force is in the direction opposite to motion) done by the friction on the ball. Next: An engine.

Hi Mishra! Examples of positive work: (1) Pushing a book on a table to some distance (2) Lifting a bucket of water (3) Pulling a box on the floor to another place (4) Climbing a tree (5) Kicking a football Examples of negative work: (1) The work done by the frictional force, when we push the book to a distance. (2) The work done by the gravitational force, when we are lifting a bucket of water. The first: (1) In a system of two positively charged particles, PE is positive, and positive work must be done to bring like charges together. In a system of two charges opposite in sign, PE is negative, and negative work must be done to bring opposite charges together. Energy is released Work is the energy transferred from an agent applying a force to an object or into heat, and the net work done on an object is the total change of kinetic energy. Both positive work and negative work have meaning: Positive work follows when the force has a component parallel to the displacement. Positive work adds energy to a system Negative work - When the force is acting opposite to the direction of the displacement, the work done by the force is taken as negative.. When we lift an object two forces act on the object. Muscular force - doing positive work in the direction of the displacement.. Gravitational force - doing negative work opposite to the direction of the displacement Work can be either positive or negative: if the force has a component in the same direction as the displacement of the object, the force is doing positive work. If the force has a component in the direction opposite to the displacement, the force does negative work The work W done on an object by a constant force is defined as W = F · d . It is equal to the magnitude of the force, multiplied by the distance the object moves in the direction of the force. In the example above F = mg = (20 kg) (9.8 m/s 2) = 196 N, W = (196 N) (1.5 m) = 294 Nm. Work is a scalar, a number with units Positive Work: If a force relocates the object in its direction, then the work done is positive. The example of this type of work done is the motion of the ball dropping towards the ground where the displacement of the ball is in the direction of the force of gravity. Negative Work: When force & displacement are in reverse directions, then the. the change in energy is positive, and when work is negative, the energy change is negative. • External force adds or subtracts energy from system • Examples of negative and positive work are illustrated in the figure • The work done by a force on a system is positive when the force and the force displacement point in the same direction. Work is done whenever energy is transferred from one store to another. Mechanical work involves using a force to move an object. Electrical work involves a current transferring energy. Work done (J) = Force (N) x Distance (m) Example: During braking, a force of 2000N is applied to the brakes of a car. The car takes 20m to come to a stop

Activity 1: Positive, Negative, or Zero Work Question Group 1 Question 1: Consider this situation: A car skids to a stop along a level highway. Is this an example of positive, negative, or zero work being done on the car? zero The force is to the left and the displacement is to the right. F and d are in the opposite direction. Thus, negative work is done The work done on the motorcycle by the Earth's gravitational force is ____. negative positive zero. negative. During a certain time interval, the net work done on an object is zero joules. We can be certain that ____. Work done by gravity is negative while the ball is traveling upward and positive while the ball is traveling downward (i) Positive work: when the force acting on the object is in the direction of displacement, then work done by a force is positive. Positive work done is given by, W = Fs cos 0° = Fs Examples: (i) When a body falls freely under gravity (θ = 0°), the work done by the force of gravity is positive. (ii) When a horse pulls a cart, the applied force and displacement are in the same direction, the.

In none of the above examples was there no work done. If you carry a book across the room, keeping its height above the floor constant, then the work done is zero. There was a force and a displacement. Work done is zero because the opposition of its weight is a vertical force and the displacement is horizontal positive, negative or zero work depending on angle between force and displacement. Can there be a force acting on an object AND no work being done? Yes, if the object isn't moving then no work is done ex: holding up a barbell. Lessens the amount of force felt example: moving your hand back when you catch a ball, you maximize the distance. The work done is zero in an isochoric process, and the P-V graph looks like: Isothermal - the temperature is kept constant. A gas confined by a piston in a cylinder is again an example of this, only this time the gas is not heated or cooled, but the piston is slowly moved so that the gas expands or is compressed

### Solved: Give An Example When The Work Done By A Force Is 1

1. If the displacement of the body is in the direction opposite to the force, then work done is negative. Hence, W =- F x S. For example: When a body moves on a surface, the force of friction between the body and the surface is in direction opposite to the motion of the body and so the work done by the force of friction is negative
2. Moving to the left, I apply a force to the left and the object moves to the left: F hand and ds are both positive: I do positive work (shown in the histogram) and friction does negative work. So, around a closed loop, the work done against friction is greater than zero, so friction is a nonconservative force
3. The work done by the force F on the object as it undergoes a displacement d is defined as. The work done by the force F is zero if: * d = 0: displacement equal to zero * [phi] = 90deg.: force perpendicular to displacement. Figure 7.2. Positive or Negative Work. The work done by the force F can be positive or negative, depending on [phi]

Remember that work done tells you about the energy transfer to or from an object by means of a force. That is why we can have zero net work done even if multiple large forces are acting on an object. Forces that result in positive work increase the energy of the object, forces that result in negative work reduce the energy of an object In each of these examples, an external force does work upon an object over a given distance to change the total mechanical energy of the object. If the external force (or nonconservative force) does positive work, then the object gains mechanical energy. The amount of energy gained is equal to the work done on the object To move a positive charge against the electric eld, work has to be done by you or a force external to the eld. The charge is forced to move from a low potential point to a high potential point, and the work done by the external force is negative. The reverse will be true for a negative charge Note that the work done by friction is negative (the force is in the opposite direction of motion), so it removes the kinetic energy. Some of the examples in this section can be solved without considering energy, but at the expense of missing out on gaining insights about what work and energy are doing in this situation ### Can you give me the examples of positive work done

Equation B: FeCl2(aq) + Na2S (aq) → FeS (s) + 2NaCl (aq) With these three examples- stoichiometry, Arrhenius acid/base, and precipitation- we find that zero is created by bringing together the lands of positive and negative. And by realizing that zero is something, students will find the term neutral is a good place to be When the work done is zero, the two conditions are: (i) When there is no displacement, S = 0 and (ii) To the direction of force when the displacement is normal, θ = 900 Question: 5 State the condition when the work done by a force is (i) positive, (ii) negative. Explain with the help of examples. Solutions Therefore, work done by a force is positive is q < 90 o. Examples of Positive Work: (1) When a spring is stretched, the work done by the stretching force is positive as the force acts in the direction of displacement of the spring. (2) When a body falls freely under gravity, the work done by gravity is positive as force (gravity) and. Positive, Zero and Negative Work done 1. The work done is positive if the force acts on a body in the direction of its motion. W = Fs cosθ W = Fs cos0º W = Fs (cos0º = 1) 2. The work done is zero if the force acts on a body in the direction perpendicular to its motion. W = Fs cosθ W = Fs cos90º W = 0 (cos90º = 0) 3 The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: b) Work done by gravitational force when a man in lifting a bucket out of a well by means of a rope tied to the bucket

If you walk down the mountain by the exact same path, then Earth's gravitational force does positive work on you. In other words, reversing the path changes the work value from negative to positive in this case. Note that if C is an oriented curve, then we let −C represent the same curve but with opposite orientation Numerically the positive work done raising it was cancelled by the negative work done lowering it resulting in zero work being done overall on the book. (The situation is different for the smashed walnut, insect, or square peg.) algebra. Work is done whenever a force results in a displacement Calculating work done by a force. A box moves horizontally when force is applied at angle . A dark grey box slides along a light grey horizontal surface. the box has a force vector F pulling up and to the left on it. A displacement vector d extends rightwards form the center of the box

Normally one would show the sum of the work done by the two external forces on a single column, but here I have chosen to break it up into two columns for clarity. As you can see, during the throw the hand does positive work, whereas gravity does a comparatively small amount of negative work, and the change in kinetic energy is the sum of the two Yes. Although work and energy are not vector quantities, they do have positive and negative values (just as other scalars such as height and temperature do.) In this case, a positive value of work means that the force acts with the motion of the object, and a negative value of work means that the force acts against the motion The net work W. done by the spring, from the sum of all these works. This work W. done by the spring force can have a positive or negative value, depending on whether the net transfer from the block as the block moves. Work is positive if the block ends up closer to the relaxed position (x = 0) than it was initially The work done against a force is the negative of the work done by the force. The work done by a normal or frictional contact force must be determined in each particular case. The work done by the force of gravity, on an object near the surface of Earth, depends only on the weight of the object and the difference in height through which it moved

1. SI unit of work is Joule. 1 Joule of work is done when a force of 1 N displaces a body by 1 m. 2. Work done = Force × displacement as displacement is zero. No work is done by the student. 3. (i) Force should be applied on body. (ii) Body should move in the direction of force. 4 In physics, work is defined as a force causing the movement—or displacement—of an object. In the case of a constant force, work is the scalar product of the force acting on an object and the displacement caused by that force. Though both force and displacement are vector quantities, work has no direction due to the nature of a scalar product (or dot product) in vector mathematics The directions of both the displacement and the applied force in the system in Figure \(\PageIndex{2}\) are parallel, and thus the work done on the system is positive. We use the letter U to denote electric potential energy, which has units of joules (J). When a conservative force does negative work, the system gains potential energy In the examples above, if the path forms a closed loop, so that the object moves around and then returns to where it starts off, the net work done by the gravitational field would be zero, and we say that the gravitational force is conservative. More generally, a force F G is said to be conservative if its line integral around a closed loop. Zero rake angle of a cutting tool. As shown in the figure, zero rake angle is in between the positive and negative rake angles. It can provide advantages of both of them; however, to some extent. Cutting tool with zero rake angle is easy to design and manufacture. Such tools also provide advantage while re-sharpening the tools

### Work, positive work and negative work - Learn Physic

1. In the previous example, you would say work done = force x distance = (- 5 Newtons)(2 meters) = -10 Joules. It really doesn't matter which method you use - just be consistent, and remember that if the direction of the force is opposite to the direction the object moves, the work done by the force is negative
2. (b) Work done by the gravitational force is negative, as the bucket moves upwards i.e., opposite to the gravitational force. (c) Work done is negative, as frictional force acts opposite to the direction of motion of the body. (d) Work done is positive because applied force acts along the same direction as the direction of motion of the body
3. WORKUnit of work:The SI unit of work is joule (J).One Joule When a force of one Newton moves a bodythrough a distance of one meter in the direction offorce, then the work done is equal to one joule. 12. CASES OF WORKPositive Work When force and displacement are in the samedirectionThen θ = 0° W = F d cos 0° = Fd x1 = Fd
4. In thermodynamics, an isobaric process is a type of thermodynamic process in which the pressure of the system stays constant: ΔP = 0. The heat transferred to the system does work, but also changes the internal energy (U) of the system.This article uses the physics sign convention for work, where positive work is work done by the system.Using this convention, by the first law of thermodynamics
5. When a force acts upon an object while it is moving, work is said to have been done upon the object by that force. Work can be positive work if the force is in the direction of the motion and negative work if it is directed against the motion of the object. Work causes objects to gain or lose energy
6. State the conditions for positive, negative, and zero work. Give at least one example of each. Answer: 1. Zero work: If the angle between force and displacement is 90°, then work done is said to be zero work. Example: When a man carries a load on his head and moves on a level road. Work done by the man on the load is zero. 2
7. Since the normal force and the direction of motion both point up, we get a positive work done by the normal force. However, since the force of gravity is doing a larger negative work, the net work is negative and net work is what equals a change in kinetic energy

### Work done by Friction

1. Since the cosine of 180 degrees is negative 1, the work done by this force is -0.11 joules. That makes the total work equal to zero joules and a change in kinetic energy of zero joules
2. Recall from Section 13.3 that if a constant force F acts on an object while it moves along a straight line through a displacement J, the work done by the force on the object is Work done = F · d. Now suppose we want to find the work done by gravity on an object moving far above the surface of the earth
3. ed by the force direction and the displacement direction. Slide 9-4

Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances.. Whereas positive feedback tends to lead to instability via exponential growth, oscillation or chaotic behavior, negative feedback. The work done by a force can be either positive or negative or zero. Positive Work. If a force displaces the object in its direction, then the work done is positive So, W=Fd The example of this kind of work done is motion of ball falling towards ground where displacement of ball is in the direction of force of gravity upward. Therefore, the work done on the bob by gravity is negative. 2. (b) As the pendulum bob swings, the force exerted by the string is radial (toward the pivot point) but the displacement is tangential, perpendicular to the force. We conclude that the work done on the bob by the string is zero. Insight: The work done by the Earth is positive.

• You'll learn how to calculate the work done by a force, and how this work is related to the change in a system's A. positive B. negative C. zero Force is in the direction of displacement ⇒positive work Example 10.1 Work done in pushing a crate Sarah pushes a heavy crate 3.0 m along the floor at Clarification of a concept Just to clarify, carrying a box in most cases is not considered work. For something to be considered work, the force you apply and the distance you apply must be in the same direction. In the case of carrying the box, you are using a vertical force to lift it, while you are going horizontally in distance. This means that zero work is being done as the force and.

### Cases where work is not done Tutor 4 Physic

restoring force. (ais is positive positive when x x is negative, and negative negative when x is positive.) • Acceleration is a maximum at the end points and it is zero at the center of oscillation. +x-a-x +a. Fm a k Look at the given examples below, we will try to clarify work with examples. Example 25 N force is applied to a box and box moves 10m. Find the work done by the force. (Sin37º=0, 6 and cos37 º=0, 8) Since the box moves in X direction, we should find the X and Y components of the applied force. Y component of the force does not responsible for. WORK Suppose that, a force is applied an object and object moves in the direction of applied force then we said work has done. Let me explain in other words. There must be a force applied to an object and object must move in the direction of the applied force. If the motion is not in the direction of force or force is applied to an object but there is no motion then we cannot talk about work Give an example of a frictional force doing negative work. Solution: Frictional forces do negative work whenever they act in a direction that opposes the motion. For example, friction does negative work when you push a box across the floor, or when you hit the brakes while driving. Chapter 7 Work And Kinetic Energy Q.6

Work: Examples 1. A car engine applies a force of 65 kN, how much work is done by the engine as it pushed a car a distance of 75 m? 2. A force does 30000 J of work along a distance of 9.5 m. Find the applied force. 3. How high can a 40 N force move a load, when 395 J of work is done? 4. How much work is required to lift a 500 kg block12 m. You know the type: coworkers who never have anything positive to say, whether at the weekly staff meeting or in the cafeteria line. They can suck the energy from a brainstorming session with a few ch 1 is always between zero and 90 , so the work done along C 1 is positive. The work done along (roughly) the rst half of C 2 is positive, and along the second half, negative. However, since the eld is stronger along the second half, the overall work done will be negative. 3. Stewart 16.2.42 [5 pts] The force exerted by an electric charge at the. Insight: The work done by the spring is negative whenever you displace the block away from x = 0, but it is positive when the displacement vector points toward x = 0.. Introduction to Potential Energy . The work energy theorem: WKtotal f i=−K i A) A force acting on a particle over a distance changes the kinetic energy of the particle. B) To calculate the change energy, you must know the. ### 1 give five example of negative work done with explanation

Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero. Solution: Here, the force acts at right angle to the displacement. So, work done by the force = 0; Here, the direction of displacement is the same as that of the force. So, work done by the force is positive. Here, the body moves in a. Examples of Ethical Behaviors in The Workplace. Examples of ethical behaviors in the workplace includes; obeying the company's rules, effective communication, taking responsibility, accountability, professionalism, trust and mutual respect for your colleagues at work. These examples of ethical behaviors ensures maximum productivity output at work   ### Can the work by kinetic friction on an object be positive

a negative work implies that the motion is in the positive direction but the work done in the opposite direction is slowing the object down. For an incorrect statement, the opposite is true: the net work done to the particle must be zero or negative. A) Positive work is done so this is incorrect. B) Positive work is done so this is incorrect parallel to the ramp. So the dot product is zero. 'Work is force times displacement. The work done on Block A is negative, while the work done on Block is positive, because the Since work is force times distance, and the distance the block travels is greager.Ïor Block B, the work done is greater for Block B The total work done on the car by all forces is: A) positive F N V A) positive B) negative C) zero T W The total work done is positive because the car is moving up the hill. (Not quite!) W=KE f-KE i=(0.5mv f 2) - (0.5mv i 2). Because the final and initial velocities are the same, there is no change in kinetic energy, and therefore no total work.

### 5 example of negative work done - Brainly

Work Done by a Force. We now consider work. In physics, work is related to force, which is often intuitively defined as a push or pull on an object. When a force moves an object, we say the force does work on the object. In other words, work can be thought of as the amount of energy it takes to move an object Justify your answer. Sol. (a) Work done should be equal to the energy possessed by the body that is . (b) Zero work is done as net displacement in the direction of force is zero. Q.11 (a) Give one situation where force is applied but no work is done. Explain why. (b) A pump is used to raise water to a height of 20 m

Work Done In Lifting and Lowering an Object. Now suppose we lift a particle-like object by applying a vertical force to it. During the upward displacement, our applied force does positive work on the object while the gravitational force does negative work on it.. In one common situation the object is stationary before and after the lift for example, when you lift a book from the floor to a shelf The work done by the gravitational force on the ball is negative during the upwards motion while it is positive on the way down. The work done when the ball returns to its original position is zero. The potential energy due to the gravitational force can be calculate Describe the work done on it (including sign) by each force acting on it and the net work done on it. Determine the Concept The normal and gravitational forces do zero work because they act at right angles to the box's direction of motion. You do positive work on the box and friction does negative work. Overall the net work is zero