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 1” 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

Inertial mass vs gravitational mass

Inertia

Apparent weightlessness

Terminal velocity

Inclined plane components

Direction of friction

Uniform circular motion is accelerated motion

Vertical circular motion

Identifying a third-law pair

Why static friction is not always μₛN

Spring force (Hooke's law)

Newton's first law

Short answer 1. Define or explain: Static vs kinetic friction

3 pts

Short answer 2. Define or explain: Orbital motion

3 pts

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

3 pts

Short answer 4. Define or explain: Force as the slope of momentum

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.