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Newton's laws of motion

A large cube of 25 kg is being accelerated across a frictionless horizontal surface by a horizontal force P. A small cube (4 kg) is in contact with the front surface of the large cube and will slide downwards unless P is sufficiently large. The coefficient of static friction between the cubes is 0.71.

a) Draw separate freebody diagrams for both the cubes.

b) What is the smallest magnitude of P in order to keep the small cube from sliding down?

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