Standing in an elevator, you give a box sitting on the floor a swift kick to mov

Question

Standing in an elevator, you give a box sitting on the floor a swift kick to move it across the floor. There is friction between the box and elevator floor. For which case would you have to kick the box the hardest to make it move?

a) The elevator speed is increasing as it begins descending from the 5th to 1st floor

b) The elevator speed is increasing as it begins ascending from the 1st to the 5th floor

c) The elevator is moving upward at a constant speed

d) The elevator is moving downward at a constant speed

e) The box requires the same level of kick regardless of the elevator motion

Explanation / Answer

Since frictional force is dependent on the normal force exerted by the floor on the body, so correct option is 'a'.

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