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Theory:

In this section, we are going to assume the situations such as,
  • When the object is not displaced despite a force acting on it.
  • Also, think of cases when an object gets displaced in the absence of a force acting on it.
An object is not displaced despite a force acting on it:
Generally, work done is always with an external agent's aspect, which produces a force on some other object. The work is said to be zero when there is no displacement of any given object along a line of force.
 
So, for example,
  • If one would have a heavyweight 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 you apply the effort (force exists), there is no change in the position or location of the weight set.
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  • A man is pushing a stationary truck.
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  • A man is pushing a rigid wall.
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  • A boy stands still while carrying a basket on his head. Here, the force of gravity acts on the basket, but there is no displacement.
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The object gets displaced in the absence of a force acting on it:
  • When the object moves at a constant velocity, the net force acting on the object is zero. But, there is a displacement along with the movement of the object. Hence, there can be a displacement of the object without a force.
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Object moves at a constant velocity
  • When we keep the ball or any other object in the inclined plane or the slanting surface, it moves to another point: displacement, without any external force acting on it.
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A ball in the slanting surface 
 
So there can be displacement without any force acting on it.