AP Physics 1 · Topic 3.2
Work and Mechanical Energy Practice
Part of Work, Energy, and Power.(TOP-3.B)
Practice questions
15
Sample questions
5 of 15 — sign in to practice the rest with adaptive difficulty and mastery tracking.
Sample 1difficulty 1/5
A satellite in circular orbit experiences gravity perpendicular to its motion. The work done by gravity in one full orbit is
- A
Positive
- B
Cannot be determined
- Ccheck_circle
Zero
- D
Negative
Why
. Gravity always points toward the center, perpendicular to velocity, so it does no work over the orbit.
- A
Sample 2difficulty 1/5
Friction between a sliding block and the floor does work on the block. The sign of this work is
- Acheck_circle
Negative
- B
Cannot be determined
- C
Positive
- D
Zero
Why
Friction opposes motion; the angle is , so .
- A
Sample 3difficulty 1/5
A horizontal force pushes a box across a floor in the direction of the force. How much work does the force do?
- A
- B
- C
- Dcheck_circle
Why
.
- A
Sample 4difficulty 2/5
For a spring obeying Hooke's law, the elastic PE stored when stretched by equals
- A
- Bcheck_circle
(triangle area)
- C
- D
(rectangle area)
Why
PE = area under -vs- for a spring = triangle of base and height , so .
- A
Sample 5difficulty 2/5
The constant force shown acts over to . The work done is
- A
- Bcheck_circle
- C
- D
Why
Work = area under -vs-: .
- A