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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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5. Test

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 independent variable in an experiment measuring work for different distances?

Please select an answer first.

Correct answer: A

The correct answer is Displacement, if the distance is deliberately changed.

  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 independent variable is selected by the investigator; work is calculated or measured as the response.
  3. Check units and conservation: The correct answer is Displacement, if the distance is deliberately changed.

The independent variable is selected by the investigator; work is calculated or measured as the response.

2. QuestionMultiple choice

What does the slope of a work-time graph represent?

Please select an answer first.

Correct answer: B

The correct answer is Average power.

  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 slope is ΔW/Δt\Delta W/\Delta t, which is average power.
  3. Check units and conservation: The correct answer is Average power.

The slope is ΔW/Δt\Delta W/\Delta t, which is average power.

3. QuestionMultiple choice

What does the slope of a force-displacement graph not generally represent?

Please select an answer first.

Correct answer: C

The correct answer is Power.

  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: For a force-displacement graph, area represents work; power requires work divided by time.
  3. Check units and conservation: The correct answer is Power.

For a force-displacement graph, area represents work; power requires work divided by time.

4. QuestionMultiple choice

Why should uncertainty be reported for an efficiency measurement?

Please select an answer first.

Correct answer: D

The correct answer is Input and useful output energies are measured with limitations.

  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: Uncertainty in energy measurements propagates into the efficiency ratio and should be communicated.
  3. Check units and conservation: The correct answer is Input and useful output energies are measured with limitations.

Uncertainty in energy measurements propagates into the efficiency ratio and should be communicated.

5. QuestionMultiple choice

Which units are dimensionally equivalent to a joule?

Please select an answer first.

Correct answer: A

The correct answer is N⋅m\text{N}\cdot\text{m}.

  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: A joule is a newton-meter, consistent with work as force times displacement.
  3. Check units and conservation: The correct answer is N⋅m\text{N}\cdot\text{m}.

A joule is a newton-meter, consistent with work as force times displacement.

6. QuestionMultiple choice

What is a useful assumption in an ideal ramp energy problem?

Please select an answer first.

Correct answer: B

The correct answer is Friction is negligible if the problem states that mechanical energy is conserved.

  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: Negligible friction allows Ki+Ui=Kf+UfK_i+U_i=K_f+U_f to be used without a thermal energy term.
  3. Check units and conservation: The correct answer is Friction is negligible if the problem states that mechanical energy is conserved.

Negligible friction allows Ki+Ui=Kf+UfK_i+U_i=K_f+U_f to be used without a thermal energy term.

7. QuestionMultiple choice

What does efficiency below 100 percent indicate?

Please select an answer first.

Correct answer: C

The correct answer is Some input energy becomes nonuseful output such as thermal or sound 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: Total energy is conserved, but not all input energy appears in the desired output form.
  3. Check units and conservation: The correct answer is Some input energy becomes nonuseful output such as thermal or sound energy.

Total energy is conserved, but not all input energy appears in the desired output form.

8. QuestionMultiple choice

What is a common source of systematic error in a work experiment?

Please select an answer first.

Correct answer: D

The correct answer is A force sensor with an incorrect zero calibration.

  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: A zero offset biases measurements in a consistent direction and can affect calculated work.
  3. Check units and conservation: The correct answer is A force sensor with an incorrect zero calibration.

A zero offset biases measurements in a consistent direction and can affect calculated work.

9. QuestionMultiple choice

What should a student conclude when measured efficiency is lower than the ideal prediction?

Please select an answer first.

Correct answer: A

The correct answer is Investigate friction, heat, measurement error, and assumptions that could account for the difference.

  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: A difference may result from nonconservative transfers or model limitations and should be evaluated with evidence.
  3. Check units and conservation: The correct answer is Investigate friction, heat, measurement error, and assumptions that could account for the difference.

A difference may result from nonconservative transfers or model limitations and should be evaluated with evidence.

10. QuestionMultiple choice

Which equation is most appropriate for average power when work and time are known?

Please select an answer first.

Correct answer: B

The correct answer is Pavg=WΔtP_{avg}=\frac{W}{\Delta t}.

  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: Average power is the rate of work transfer, so divide work by the elapsed time.
  3. Check units and conservation: The correct answer is Pavg=WΔtP_{avg}=\frac{W}{\Delta t}.

Average power is the rate of work transfer, so divide work by the elapsed time.

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