Card 33 / 36: You find experimentally that the force required to start sliding motion of a block of mass 20 kg on a horizontal surface is 12 N. If the same surface is inclined to a 30 degree slope with respect to gravity, what force (in addition to gravity) is required to initiate sliding motion of the object?
A)
0 N
B)
196 N
C)
12 N
D)
108 N
E)
170 N
Answer:
D) 108 N
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