A front liner holds a COVID-19 vaccine transport box over his head at a height of 3.2 m from the ground. The box has a weight of 253N. How much work is being done in holding the box in this elevated position?
Question
A front liner holds a COVID-19 vaccine transport box over his head at a height of 3.2 m from the ground. The box has a weight of 253N. How much work is being done in holding the box in this elevated position?
Solution
The work done on an object is defined as the force applied to it times the distance over which it is applied, and it is directed in the direction of the force. In this case, the force is the weight of the box (253N) and the distance is the height at which it is held (3.2m). However, the box is not being moved - it is being held stationary. Therefore, the distance over which the force is applied is 0.
In physics, work is only done if an object is displaced. Since the box is not being moved, the work done on the box is 0.
So, even though the front liner is exerting a force to hold the box, he is not doing any work on the box in the physics sense because the box is not moving.
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