If a box is considered a system, the force on the box due to the weight of a ball resting on it is an example of internal force.

True

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False

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Solution

The correct option is B False

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Q. A box of bananas weighing 40.0N rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.40 and the coefficient of kinetic friction is 0.20.
a. If no horizontal force is applied to the box and the box is at rest, how large is the friction force exerted on the box?
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c. What minimum horizontal force must the monkey apply to start the box in motion?
d. What minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has been started?
e. If the monkey applies a horizontal force of 180 N, What is the magnitude of the friction force and what is the box's acceleration?

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