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Work, Energy and Power Practice Tests

These Grade 11 Science practice tests examine work, the work-energy theorem, kinetic energy, gravitational and elastic potential energy, conservation, power, efficiency, system boundaries, and energy data.

Skills covered

  • Calculating work from force, displacement, angle, and force-displacement graphs
  • Applying the work-energy theorem and kinetic, gravitational, and elastic potential energy equations
  • Tracking mechanical energy, thermal energy, conservation, system boundaries, and frictional transfers
  • Calculating power, efficiency, energy consumption, machine trade-offs, and rates of transfer
  • Interpreting work and power graphs, uncertainty, experimental variables, model assumptions, and conclusions

How to use these practice tests

Choose the system boundary, identify the energy forms and transfers, write the relevant equation, and check whether the units and conservation statement match the physical situation.

For more Grade 11 Science practice, return to the Grade 11 Science category.

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Grade 11 Work, Energy and Power Practice Tests

Practice Grade 11 Science questions about work, the work-energy theorem, kinetic and potential energy, springs, conservation, power, efficiency, systems, and data.

Choose the best answer. Define the system, identify energy transfers, select the correct equation, and check units and conservation.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What is the translational kinetic energy of a mass m moving at speed v?

Please select an answer first.

Correct answer: A

The correct answer is K=12mv2K=\frac{1}{2}mv^2.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Kinetic energy depends on mass and the square of speed: K=12mv2K=\frac{1}{2}mv^2.
  3. Check units and conservation: The correct answer is K=12mv2K=\frac{1}{2}mv^2.

Kinetic energy depends on mass and the square of speed: K=12mv2K=\frac{1}{2}mv^2.

2. QuestionMultiple choice

What is gravitational potential energy near Earth's surface?

Please select an answer first.

Correct answer: B

The correct answer is Ug=mghU_g=mgh.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Relative to a chosen zero level, gravitational potential energy near Earth is Ug=mghU_g=mgh.
  3. Check units and conservation: The correct answer is Ug=mghU_g=mgh.

Relative to a chosen zero level, gravitational potential energy near Earth is Ug=mghU_g=mgh.

3. QuestionMultiple choice

What is the elastic potential energy of an ideal spring stretched by x?

Please select an answer first.

Correct answer: C

The correct answer is Us=12kx2U_s=\frac{1}{2}kx^2.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: The energy stored in an ideal spring is Us=12kx2U_s=\frac{1}{2}kx^2.
  3. Check units and conservation: The correct answer is Us=12kx2U_s=\frac{1}{2}kx^2.

The energy stored in an ideal spring is Us=12kx2U_s=\frac{1}{2}kx^2.

4. QuestionMultiple choice

What is mechanical energy?

Please select an answer first.

Correct answer: D

The correct answer is The sum of kinetic and potential energy.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Mechanical energy is often written Emech=K+UE_{mech}=K+U, including the relevant potential energies.
  3. Check units and conservation: The correct answer is The sum of kinetic and potential energy.

Mechanical energy is often written Emech=K+UE_{mech}=K+U, including the relevant potential energies.

5. QuestionMultiple choice

What happens to mechanical energy when friction does negative work?

Please select an answer first.

Correct answer: A

The correct answer is Some mechanical energy is transferred into thermal energy.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Friction transfers mechanical energy to internal or thermal energy; total energy can still be conserved.
  3. Check units and conservation: The correct answer is Some mechanical energy is transferred into thermal energy.

Friction transfers mechanical energy to internal or thermal energy; total energy can still be conserved.

6. QuestionMultiple choice

A frictionless object descends a ramp. What happens to its gravitational potential energy?

Please select an answer first.

Correct answer: B

The correct answer is It decreases while kinetic energy increases.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: In a frictionless system, gravitational potential energy converts into kinetic energy while total mechanical energy remains constant.
  3. Check units and conservation: The correct answer is It decreases while kinetic energy increases.

In a frictionless system, gravitational potential energy converts into kinetic energy while total mechanical energy remains constant.

7. QuestionMultiple choice

Why is the zero level for gravitational potential energy arbitrary?

Please select an answer first.

Correct answer: C

The correct answer is Only changes in potential energy affect physical predictions.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Changing the reference adds a constant to potential energy but does not change ΔUg\Delta U_g or forces.
  3. Check units and conservation: The correct answer is Only changes in potential energy affect physical predictions.

Changing the reference adds a constant to potential energy but does not change ΔUg\Delta U_g or forces.

8. QuestionMultiple choice

What happens to spring energy if compression doubles?

Please select an answer first.

Correct answer: D

The correct answer is It becomes four times as large.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Since Us=12kx2U_s=\frac{1}{2}kx^2, doubling x multiplies energy by four.
  3. Check units and conservation: The correct answer is It becomes four times as large.

Since Us=12kx2U_s=\frac{1}{2}kx^2, doubling x multiplies energy by four.

9. QuestionMultiple choice

What does an energy bar chart compare?

Please select an answer first.

Correct answer: A

The correct answer is The amounts of different energy forms before and after a process.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Energy diagrams track transfers and transformations and help check conservation for the chosen system.
  3. Check units and conservation: The correct answer is The amounts of different energy forms before and after a process.

Energy diagrams track transfers and transformations and help check conservation for the chosen system.

10. QuestionMultiple choice

If mass doubles at the same speed, what happens to kinetic energy?

Please select an answer first.

Correct answer: B

The correct answer is It doubles.

  1. Identify the energy system: Determine the force, energy form, system boundary, or rate of transfer described in the question.
  2. Apply the work-energy relationship: Kinetic energy is directly proportional to mass when speed is fixed.
  3. Check units and conservation: The correct answer is It doubles.

Kinetic energy is directly proportional to mass when speed is fixed.

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