Two identical blocks, P and Q, are at rest on a flat, frictionless table. P is p

Question

Two identical blocks, P and Q, are at rest on a flat, frictionless table. P is pushed by a hand exerting a constant force of magnitude Fo to the right, and Q is pushed by a hand exerting a constant force of magnitude Fo to the left. At time t = t1, each block has moved a distance do from its initial position, as shown below. Answer the following questions based on this setup.

If there is no friction, then Q’s kinetic energy _________________ as it is being pushed

Is it possible for Q’s kinetic energy to increase as it is being pushed if there is kinetic friction with the surface?

Explanation / Answer

a) As there is no friction, the workdone by the pushing force can be converted as the kinetic energy so it increases.

b) Yes it is possible to increase by applying the force more than the kinetic frictional force.

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