force - pushing a block 4

0 pts ended

A block of massmlies on a horizontal table. The coefficient of static friction between the block and the table ismu_s. The coefficient of kinetic friction ismu_k, with\mu_{\rm k} < \mu_{\rm s}.

B.Suppose you want to move the block, but you want to push it with the least force possible to get it moving. With what forceFmust you be pushing the block just before the block begins to move?

C.Suppose you push horizontally with half the force needed to just make the block move. What is the magnitude of the friction force?

D.Suppose you push horizontally with precisely enough force to make the block start to move, and you continue to apply the same amount of force even after it starts moving. Find the accelerationaof the block after it begins to move.

Answers (2)


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