Acceleration of Blocks

[Soaring Crane]

For the following problems, I don't know how to start [*(]. Please explain every step to me with emphasis on the difference in finding the blocks' acceleration accompanied by the coefficient of friction and the case if it was not present. [I have other problems I need to do.]

Find each block's acceleration.

1. A 20 kg block (A) rests on a table; a cord attached to the block extends horizontally to a pulley at the edge of the table. A 10 kg mass, which has the shape of a block, (B) hangs at the end of the cord. The coefficient of [kinetic] friction is 0.5.

2. A 40 kg block slides down an inclined plane. The incline is 35° and the coefficient of friction is 0.2.

Thanks a million. [:)]

[Integral]

1. Draw a force diagram, recall that friction is porportional to the the Normal force and opposes motion. Now sum your forces and solve of acceleration.
2. Essentially the same process as above.

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