AP Physics C Test: Chapter 4-5

1. An astronaut applies a force of 500 N to an asteroid and it accelerates at 7.00 m/s². What is the asteroid’s mass?

• 71 kg

• 135 kg

• 441 kg

• 3,500 kg

Which of the following is an example of the type of force, which acts at a distance?

• gravitational

• magnetic

• electrical

• all of the above

Two ropes are attached to a 40-kg object. The first rope applies a force of 25 N and the second, 40 N. If the two ropes are perpendicular to each other, what is the resultant acceleration of the object?

• 1.2 m/s²

• 3.0 m/s²

• 25 m/s²

• 47 m/s²

4. A block of mass 5.00 kg rests on a horizontal surface where the coefficient of sliding kinetic friction between the two is 0.200. A string attached to the block is pulled horizontally, resulting in a 2.00-m/s² acceleration by the block. Find the tension in the string. (g = 9.80 m/s²)

• 0.200 N

• 9.80 N

• 19.8 N

• 10.0 N

The statement by Newton that “for every action there is an opposite but equal reaction” is regarded as which of his laws of motion?

• first

• second

• third

• fourth

A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest (45° N of W). What is the magnitude of the resultant acceleration?

• 2.2 m/s²

• 2.1 m/s²

• 1.5 m/s²

• 3.0 m/s²

A cart of weight 20 N is accelerated across a level surface at 0.15 m/s². What net force acts on the wagon? (g = 9.8 m/s²)

• 0.92 N

• 0.31 N

• 3.0 N

• 4.5 N

A 10-kg mass and a 2.0-kg mass are connected by a light string over a massless, frictionless pulley. If g = 9.8 m/s², what is the acceleration of the system when released?

• 2.5 m/s²

• 6.5 m/s²

• 7.8 m/s²

• 9.8 m/s²

A 100-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15°. What is the coefficient of static friction between box and ramp?

• 0.15

• 0.27

• 0.77

• 0.95

A 15-kg block rests on a level frictionless surface and is attached by a light string to a 5.0-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s², what is the tension in the connecting string?

• 65 N

• 17 N

• 49 N

• 37 N