please show the steps on working the problem so i can do it on my own for the te
ID: 2007659 • Letter: P
Question
please show the steps on working the problem so i can do it on my own for the test. thank you!A 3.900kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is µs=0.455 and the coefficient of kinetic friction is µk=0.205. At time t=0, a force F=10.7 N is applied horizontally to the block. State the force of friction applied to the block by the table at the following times:
t=0 _______N
t > 0 _______N
Consider the same situation, but this time the external force F is 21.6N. Agian state the force of friction acting on the block at the following times:
t=0 __________N
t > 0 __________N
Explanation / Answer
the maximum static friction f max = sMg = (0.455)(3.9)(9.8) = 17.39 N
since applied force F is smaller than f max, so the block does not move,
f - F = 0
f = F
t = 0, 10.7 N
t > 0, 10.7 N
b)
applied force F > fmax, so block will start to move
t = 0, f = fmax = 17.39 N
t > 0, f = kMg = (0.205)(3.9)(9.8) = 7.84 N
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