APC Quick quiz - normal and friction

A 10 kg block is sliding down a 30^o ramp at constant velocity. What is the magnitude of the frictional force? Take g= 10 m/s²

• 100 N

• 86.6 N

• 50 N

A 10 kg block is at rest on a 30^o ramp. What is the magnitude of the frictional force? Take g= 10 m/s²

• 100 N

• 86.6 N

• 50 N

A 10 kg block is being pushed across a floor at constant velocity by a force F_A = 50 N, acting at 45° below horizontal. What is the frictional force?

• 50 N

• 35.4 N

• 64.7 N

A force of 600 N is applied at 45° above horizontal. The coefficients of friction between the crate and the surface are μ_S = 0.60 and μ_k = 0.40. What is the box's acceleration? Take g = 10 m/s².

• 4.24 m/s²

• 1.94 m/s²

• 2.43 m/s²

• 0.79 m/s²

5. An elevator accelerates up at +5.0 m/s² . A horizontal force of 500 N is applied to the crate. A 100 kg crate is initially at rest on a surface. The coefficients of friction between the crate and the surface are μ_S = 0.30 and μ_k = 0.10. What is the horizontal acceleration of the crate? Take g = 10 m/s²

• 5.0 m/s²

• 3.0 m/s²

• 0.5 m/s²

• 3.5 m/s²

1. Two masses connected by a string are pulled across a horizontal frictionless surface with a horizontal force of 25 N. The first mass is 30 kg and the second mass is 12 kg.

2. Determine the tension in the string.

• 25 N

• 12.5 N

• 10 N

• 7.1 N

1. Two masses connected by a string are pulled across a horizontal frictionless surface with a horizontal force of 25 N. The first mass is 12 kg and the second mass is 30 kg.

Determine the tension in the string.

• 25 N

• 12.5 N

• 7.1 N

• 17.9 N