Unit 3: Work, Energy, and Power
Physics 1 · Unit 3 · Paper 2

Work, Energy, and Power 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 1Paper 2Paper 3
Each paper is built from this unit’s 51 terms and is the same for everyone, so a teacher can assign “Unit 3, 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 33 min 30 points0/17 attempted
1

Doubling the speed quadruples the kinetic energy

2

Energy accounting with friction

3

Conservative force, defined by path independence

4

When mechanical energy is not conserved

5

Why the system boundary decides your equation

6

Why energy methods ignore the path

7

Work

8

Force is the negative slope of U(x)

9

Power at constant speed

10

Conservative vs non-conservative forces

11

Gravitational potential energy

12

Elastic potential energy

Short answer 1. Define or explain: Work-energy theorem

3 pts

Short answer 2. Define or explain: Hooke's law

3 pts

Short answer 3. Define or explain: Energy bar charts

3 pts

Short answer 4. Define or explain: Why mass cancels in energy problems

3 pts

Free response

6 pts

A 2.0 kg block is released from rest at the top of a frictionless incline of height 1.8 m. At the bottom it slides onto a horizontal surface with μk = 0.25 and stops.

Using energy conservation, find the speed at the bottom of the incline.

Find the distance it travels on the rough surface before stopping.

On a labeled axis, sketch kinetic energy vs horizontal distance on the rough surface. (Use g = 10 m/s².)