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A Horizontal Force Acts on a Mass M That

Question 21
Multiple Choice

A horizontal force img acts on a mass m that lies on a horizontal surface. The acceleration of m is img . The coefficient of kinetic friction µk between mass m and the surface can be calculated from A) µk = a/g B) µk = (F/mg) - (a/g) C) µk = (F/mg) + (a/g) D) µk = 0 E) None of these is correct.

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Q 22
A mass m2 = 1.5 kg rests on a horizontal table. The coefficients of friction between m2 and the table are µs = 0.3 and µk = 0.25. The mass m2 is attached by strings to masses m1 = 2.5 kg and m3 = 4.5 kg as shown. Masses m1 and m3 hang freely. The system is initially held at rest. After it is released, the acceleration of m2 is approximately A) 1.9 m/s2 B) 2.4 m/s2 C) 3.0 m/s2 D) zero E) 13 m/s2
Q 23
A horizontal force is used to push an object of mass m up an inclined plane. The angle between the plane and the horizontal is . The normal reaction force of the plane acting on the mass m is A) mg cos + F cos B) mg cos C) mg cos + F sin D) mg cos - F cos E) impossible to determine because the coefficient of friction is not given.
Q 24
A block with a mass of 10 kg is at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.30, and the coefficient of kinetic friction is 0.25. A force of 20 N acts on the block toward the left. The magnitude of the frictional force on the block is A) 10 N B) 20 N C) 0.10 kN D) 30 N E) 3.0 N
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