Force and Translational Dynamics unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1 Paper 2 Paper 3

Each paper is built from this unit’s 43 terms and is the same for everyone, so a teacher can assign “Unit 2, Paper 3” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.

Suggested time 36 min 33 points0/17 attempted

Centripetal force is not a new force

Free-body diagram errors

Terminal velocity

Newton's law of universal gravitation

Inclined plane components

Uniform circular motion

Newton's law of gravitation

Normal force on an incline

Identifying third-law pairs

Newton's first law

Gravitational field strength

Elevator problems

Short answer 1. Define or explain: Force as the slope of momentum

3 pts

Short answer 2. Define or explain: Why static friction is not always μₛN

3 pts

Short answer 3. Define or explain: Newton's third law

3 pts

Short answer 4. Define or explain: Systems and internal forces

3 pts

Free response

9 pts

A 3.0 kg block rests on a frictionless incline that makes an angle of 30° with the horizontal. A light string runs from the block, up the incline, over an ideal frictionless pulley at the top, and down to a 2.0 kg block hanging freely. The system is released from rest. Use g = 10 m/s².

Describe the free-body diagram for each block, naming every force and its agent.

Calculate the magnitude of the acceleration of the system.

Calculate the tension in the string.

The incline surface is replaced with one having μs = μk = 0.10. Determine whether the system still accelerates in the same direction, and calculate the new acceleration.

Explain why the tension cannot equal the hanging block’s weight while the system accelerates.