Answer :
a) Force does the floor exert on the block= 66.591 N
b) Force exerted by floor on 15lb block = 22.197 N
Force is defined as an influence that can change the motion of an object. A force can also cause an object with mass to change its velocity that is to accelerate.
Given mass = 15 lb
1lb= 0.453 kg
m= 15 * 0.453
=6.759 kg
Weight, W= mg
= 6.795 * 9.8
=66.591 N
a) when block is at rest, no force other than normal is acting on it
Therefore N= W= 66.591 N
b) when rope is tied to the block and is run vertically over a pulley, then tension of rope is equal to weight of hanging object
T+ N1 = W
N1 is normal force exerted by floor on block
W1 is object weight
W1 + N1 = W
mg + N1= W
(10 *0.453* 9.8) + N1 = 66.591
N1 = 22.197 N
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Note : The given question is incomplete on the portal. Here is the complete question.
Question: A 15 lb block rests on the floor. (a) what force does the floor exert on the block? (b) A rope is tied to the block and is run vertically over a pulley . The other end is attached to a free hanging 10 lb object. What now is the force exerted by the floor on the 15lb block.?
