Someone please help me with physics question?

Posted on 2015-01-06 06:46:00 in Physics by DAVID

Block A is sitting on block B when an external force from the left begins to push on block B. The increases in magnitude as a function of time. A t first block A and B move together, but eventually block A starts to slide relative to block B. Before it starts a static frictional force acts to the right and after it slides a kinetic frictional force acts to the right.

I know NCS answered me but this is an extension for the this problem.

What I don't understand is why the friction force in the right direction and the external force is also in the right direction; shouldn't the external and friction forces opposite each other?

Also, is the friction force in the right direction on block B as well as block A?

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