You want to apply a force on a box so that it moves with constant speed across a horizontal floor. The coefficient of kinetic friction between the box and the floor is μ k . Of the four following ca

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You want to apply a force on a box so that it moves with constant speed across a horizontal floor. The coefficient of kinetic friction between the box and the floor is μ k ​ . Of the four following cases, the force you apply on the box will be smallest when you.

TestHub · Accepted Answer

Pushing at angle θ below horizontal: N 1 ​ = M g + F sin θ (more normal force, more friction). Pulling at angle θ above horizontal: N 2 ​ = M g − F sin θ (less normal force, less friction). Horizontal push or pull: N = M g . Friction μ N is smallest when the normal force is smallest, so pulling at an upward angle needs the smallest force. Answer: (B).

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