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 2” 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

Weight vs mass

Newton's first law

Identifying third-law pairs

Apparent weight

Weight

Newton's law of universal gravitation

Banked curve

Gravitational field strength

Why static friction is not always μₛN

Orbital speed

Newton's law of gravitation

Elevator problems

Short answer 1. Define or explain: Apparent weightlessness

3 pts

Short answer 2. Define or explain: Systems and internal forces

3 pts

Short answer 3. Define or explain: Spring force (Hooke's law)

3 pts

Short answer 4. Define or explain: Vertical circular motion

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.