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State the conditions when the work done is ZERO.?

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In physics, work done is actually always with the aspect of an external agent which is known to produce a force on some other entity. The work is stated as zero when there is no displacement of any given object along a line of force. So for example, if one would have a massive weight set of gym equipment...
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In physics, work done is actually always with the aspect of an external agent which is known to produce a force on some other entity. The work is stated as zero when there is no displacement of any given object along a line of force. So for example, if one would have a massive weight set of gym equipment and you are trying to lift it, but you are not able to do the same, here the work done by you would be zero because even though the effort or force is applied by you exists, there is no change in the location of the weight set.

Another  example of zero work done in physics are:

Speaking about electrostatics, work done, is the product of charge and the potential difference. If the charge is moved along an equipotential surface, then the potential difference is known to be zero between the given two points.

 Hope this helps

 

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When there is no force or no displacement.. or the direction of displacement is perpendicular to the direction of force
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Teacher

When the displacement is zero OR when the force acts at right angles to the direction of the displacement
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A force with no motion or a force perpendicular to the motion does no work. Case 1 : When a force is exerted on an object which does not move,no work is done on the object. Explanation : No matter how hard or how long you have pushed, if the object does not move, then you have done no work on the...
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A force with no motion or a force perpendicular to the motion does no work. Case 1 : When a force is exerted on an object which does not move,no work is done on the object. Explanation : No matter how hard or how long you have pushed, if the object does not move, then you have done no work on the object. It is sitting still in the same place! Why then do you feel fatigued (as well as frustrated, etc. ). The resolution to this dilemma comes in considering that when your muscles are used to exert a force on something, the individual muscle fibers are in a continual process of contracting and releasing to maintain the net collective result of a steady force on an external object. That contracting and releasing involves force and motion, and constitutes internal work in your body. The energy shows up as warming in your muscle tissue, but if the object doesn't move, there is still no net work on the object. ---------------------------------------... Case 2 : When an object is carried by the person at constant velocity by a force which acts at the right angles to the motion,no work is done on the object. Explanation : If the object is being carried at constant velocity, then no net force is necessary to keep it in motion. The force exerted by the person is an upward force equal to the weight of the object, and that force is perpendicular to the motion. If there is no motion in the direction of the force, then no work in done by that force. Yet you certainly feel like you are doing work if you carry a heavy box. The resolution of the paradox is similar to the first example - your muscles must maintain an extra tension to stay upright under the load. This requires a greater amount of internal contraction and release of our muscle fibers, and hence internal work in our bodies. But the work done on the object is zero since by moving in a straight line at constant speed, it's energy is remaining the same. read less
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Maths Tutor

Work done =F*D Vector form W= | F | |D| cos(x) When x= 90° n 270° W=0 as cos90° =0 Therefore at perpendicular conditions work done wil bbe zero !
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When is work done bye a force position
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Physics Subject Expert

Work is said to be done when applied force provides displacement for a body. If there is no displacement for the body after the force is applied then work done is zero. Another case is if the motion is perpendicular to the force then work done a zero. Work,W= F S Cos ?. When angle between force and...
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Work is said to be done when applied force provides displacement for a body. If there is no displacement for the body after the force is applied then work done is zero. Another case is if the motion is perpendicular to the force then work done a zero. Work,W= F S Cos ?. When angle between force and displacement is 90, Cos 90 becomes zero, ie work done = 0 read less
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Maths Tutor

when the displacement is zero.
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Math & Science & Engg. Tutelage

Work is the dot product of two vectors force and displacement. W=Fd cosx where x is the angle between force and displacement. Cos 90, 270 degree = 0, which means that when the angle x between force and displacement is 90 or 270 the work done is 0.
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When the angle between force vector and displacement vector is 90 degree then the work done is said to be zero. W= f.s
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