Consider the situation where you are pulling a block with a string, where the bl

Question

Consider the situation where you are pulling a block with a string, where the block is moving on a surface with friction, as shown in the figure in the middle of page 153 in your lab manual.

If the block pictured is moving with a constant velocity of 1.0 m/s, what can you say about the required applied force (provided by the string) needed to move the block at 2.0 m/s ?

A) The applied force will be larger, but we do not how much larger without knowing the friction force B) There will be twice as much work done against friction, so the applied force needs to be doubled C) The kinetic friction is independent of velocity, so the applied force can be the same, after we are done accelerating the block D) The force will depend on the size of the friction at the new velocity, so it must measured at the new speed

Explanation / Answer

C) The kinetic friction is independent of velocity, so the applied force can be the same, after we are done accelerating the block

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