A 14.0-lb block rests on the floor. (a) What force does the floor exert on the b

Question

A 14.0-lb block rests on the floor.

(a) What force does the floor exert on the block?

(b) If a rope is tied to the block and run vertically over a pulley, and the other end is attached to a free-hanging 11.5-lb weight, what is the force exerted by the floor on the 14.0-lb block?

(c) If we replace the 11.5-lb weight in part (b) with a 31.5-lb weight, what is the force exerted by the floor on the 14.0-lb block?

Explanation / Answer

a) 14 lb up

b) 14-11.5 = 2.5 lb upwards

c) the block will lift up so

the floor does not exert force on the block

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