A) A constant force 3 F is needed. B) A force that gradually increases from F to

Question

       A) A constant force 3F is needed.
       B) A force that gradually increases from F to 3F is needed.
       C) A constant force F is needed.
       D) No force is needed since the crate has no acceleration.
       E) A force that gradually decreases from 3F to F is needed.

A force F is required to push a crate along a rough horizontal floor at a constant speed V with friction present. What force is needed to push the crate along the same floor at a constant speed 3V if friction is the same as before?

Explanation / Answer

Here ,

the kinetic friction is given as

Friction force = uk*N

where N is normal force ,

the frictional force is independent of speed of crate

Now, at cosntant velocity

applied force = frictional force

hence , for 3V velocity also ,

C) A constant force F is needed.

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