These examples illustrate that work involves both force and movement in the direction of the force, aligning with the scientific definition that work equals force times distance.
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No, work is not done if there is no displacement, even if force is applied.
The two key components are the exertion of force and the displacement of the object.
Work is indicated by the trolley moving through a distance due to the force exerted by the girl.
The pebble must be moved through a distance by an exerted force.