A box with weight 44 N is on a rough horizontal surface. An external force F is
ID: 1318910 • Letter: A
Question
A box with weight 44 N is on a rough horizontal surface. An external force F is applied horizontally to the box. A normal force and a friction force are also present, denoted by n and f. A force diagram, showing the four forces that act on the box, is shown in the figure. When force F equals 4.2 N , the box is in motion at constant velocity. The box decelerates when force F is removed. The magnitude of the acceleration of the box is closest to:
zero
Show your work so I can understand how to complete this:
0.94 m/s2 0.72 m/s2 0.24 m/s2 0.48 m/s2zero
Show your work so I can understand how to complete this:
Explanation / Answer
when force is in action a = 0
f = F so f = 4.2 N
and mass m = W/g = 44/9.81 = 4.49 kg
when F is in not action, there is only f in horizontal direction,
f = ma
4.2 = 4.49a
a = 0.94 m/s2
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