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Will a box move under force?

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A 55.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300. A force of 156 N is applied to the box directed at an angle of 18.0 above the horizontal. Does the box move?

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Solution Summary

Brief calculations show how to work out if a given box will move under a specific force and friction.

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Friction: Box in a Truck

Consider a box in back of a pickup truck.

1. If the truck accelerates slowly, the box moves with the truck without slipping. What force or forces act on the box to accelerate it? In what direction do these forces point?

2. Draw a free body diagram of the box

3. What happens to the box if the truck accelerates too rapidly? Explain why this happens, basing your explanation on physical models.

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