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AP Physics C: Mech

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Unit 2

2.5 Multiple Choice

5 min read•december 22, 2021

AP Physics C: Mechanics ⚙️

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Multiple Choice Practice for Newton's Laws of Motion

Welcome to Unit 2 AP Physics C: Mechanics Multiple Choice Questions! Grab some paper and a pencil 📄 to record your answers as you go. You can see how you did on the Unit 2 Practice Questions Answers and Review sheet once you're done. Don't worry, we have tons of resources available if you get stumped 😕 on a question. And if solo study is not your thing, join a group in Hours! Not ready to take a quiz yet? Take a look at the Intro to Unit 2.

Image courtesy of Pixabay

Facts about the test: The AP Physics C: Mechanics exam has 35 multiple choice questions and you will be given 45 minutes to complete the section. That means it should take you around 15 minutes to complete 12 questions.

The following questions were not written by College Board and, although they cover information outlined in the AP Physics C: Mechanics Course and Exam Description, the formatting on the exam may be different.

1. Which of the following situations can be represented by the free body diagram pictured?

A. An egg falls from a nest towards the Earth in the presence of air resistance.

B. A cart slides down a ramp due to the force of gravity

C. A wagon is pulled at an angle by its handle along the rough sidewalk.

D. A sign hangs from a rope off of the edge of a building.

2. Three blocks (A, B, and C) are connected together at rest on a frictionless surface as pictured. The mass of block A is 5kg, the mass of block B is 2kg, and the mass of block C is 1kg. Which rope exerts the biggest force as the blocks are accelerated to the right?

A. A

B. B

C. C

D. All experience the same force.

3. Which of the following is equivalent to a unit of force?

A. kg(m/s)

B. kg(m/s^2)

C. kg(m^2/s^2)

D. m/s^3

4. A 5kg ball on a 1.5m string swings in a vertical circle with a uniform linear speed of 2 m/s. At the top of the circle, which value is the closest to the magnitude of the tension force in the string?

A. 35 N

B. 42 N

C. 56 N

D. 62 N

5. The goal of a spin cycle for a washing machine is to remove the excess water from the clothes. Which of the following statements is true about how a washing machine accomplishes this?

A. The washer container exerts a centripetal force on the water pushing it out of the machine.

B. The inertia of the clothes pushes the water out of the machine.

C. The centrifugal force of the spinning motion pulls the clothes into the center of the machine more than the water, because of the bigger mass of the clothes.

D. The circular wall in the washer exerts a centripetal force on the clothes, but the holes in the wall don't apply force, allowing the water to keep moving in a straight line out of the container.

6. A car is turning left around a flat curve with radius R. What is the correct expression for the maximum speed that the car can turn without slipping?

A. v = (coefficient of static friction * g * R)

B. v = sqrt(coefficient of static friction*g*R)

C. v = g*R

D. v = g*R^2

7. A toy yo-yo moves in uniform circular motion in a vertical circle shown in the image. Which of the arrows depicts the direction of the net force on the yo-yo?

A. A

B. B

C. C

D. D

8. Jack Sparrow shoots a cannon from a cannonball and hits an enemy ship. Which of the following statements is always true?

A. The ship exerts an equal and opposite force on the cannon, through the interaction with the cannonball.

B. The cannon exerts an equal force that the cannonball exerts on the ship, just in the other direction.

C. The cannon pushes the cannonball forwards, and the cannonball exerts an equal force on the ship it hits.

D. The cannonball exerts an equal force that pushes the cannon backwards as it is being propelled forwards out of the cannon.

9. Two identical masses hang at rest over a massless, frictionless pulley as seen in the image. What is the correct expression for the frictional force exerted on mass 1 by the table in order to keep the masses at rest?

A. m1g

B. m2g

C. g(m2 + m1)

D. g(m2 - m1)

10. A 62kg human is standing on a human-sized Newton scale in an elevator accelerating upward at 2 m/s^2. What is the closest approximation to the scale reading?

A. 124N

B. 480N

C. 608N

D. 730N

11. A woman is pulling a 25kg shopping cart at an angle at a constant velocity. She exerts a force of 20N and the frictional force on the shopping cart is 10N. At what angle is she pulling?

A. 0 degrees

B. 30 degrees

C. 35 degrees

D. 60 degrees

12. A 10 kg ball rotates in uniform circular motion at a speed of 2 m/s on the end of 4 m long string. If the ball is moving in a horizontal circle, what is its centripetal acceleration?

A. 0.5 m/s^2

B. 1 m/s^2

C. 2 m/s^2

D. 10 m/s^2

13. Jayden uses the same net force to push two shopping carts along the same patch of parking lot. If the Green Cart has four times the acceleration of the Blue Cart, which of the following is true?

A. There's not enough information to tell.

B. The Blue Cart and the Green Cart have the same mass

C. The Blue Cart has one fourth the mass of the Green Cart.

D. The Blue Cart has four times the mass as the Green Cart.

14. A passenger is in a moving car, facing forward. They suddenly jerk forwards and are kept in place by their seatbelt. This is an indication of which of the following descriptions of the motion of the car?

A. The car slowed down quickly

B. The car sped up quickly

C. The car turned left

D. The car turned right

15. In the diagram, two blocks with masses m and 3m respectively are in contact on a horizontal frictionless surface. If they are being pushed with a force F as shown. What is a correct expression for the acceleration of the 3m block?