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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 power?

Please select an answer first.

Correct answer: A

The correct answer is The rate of energy transfer or work.

  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: Power measures how quickly work is done: P=WΔtP=\frac{W}{\Delta t}.
  3. Check units and conservation: The correct answer is The rate of energy transfer or work.

Power measures how quickly work is done: P=WΔtP=\frac{W}{\Delta t}.

2. QuestionMultiple choice

What is average power?

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 total work or energy transferred divided by the elapsed time.
  3. Check units and conservation: The correct answer is Pavg=WΔtP_{avg}=\frac{W}{\Delta t}.

Average power is total work or energy transferred divided by the elapsed time.

3. QuestionMultiple choice

What is the SI unit of power?

Please select an answer first.

Correct answer: C

The correct answer is The watt, equal to one joule per second.

  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: One watt is one joule per second, so it measures the rate of energy transfer.
  3. Check units and conservation: The correct answer is The watt, equal to one joule per second.

One watt is one joule per second, so it measures the rate of energy transfer.

4. QuestionMultiple choice

What is efficiency?

Please select an answer first.

Correct answer: D

The correct answer is The ratio of useful output energy to input 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: Efficiency is commonly η=EusefulEinput×100%\eta=\frac{E_{useful}}{E_{input}}\times100\%.
  3. Check units and conservation: The correct answer is The ratio of useful output energy to input energy.

Efficiency is commonly η=EusefulEinput×100%\eta=\frac{E_{useful}}{E_{input}}\times100\%.

5. QuestionMultiple choice

Two machines do the same work. Which has greater power?

Please select an answer first.

Correct answer: A

The correct answer is The machine that completes the work in less time.

  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 the same work, power is larger when the time interval is smaller.
  3. Check units and conservation: The correct answer is The machine that completes the work in less time.

For the same work, power is larger when the time interval is smaller.

6. QuestionMultiple choice

A motor transfers 600 J in 20 s. What is its average power?

Please select an answer first.

Correct answer: B

The correct answer is 30 W30\,\text{W}.

  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: Using P=W/tP=W/t, P=600/20=30 WP=600/20=30\,\text{W}.
  3. Check units and conservation: The correct answer is 30 W30\,\text{W}.

Using P=W/tP=W/t, P=600/20=30 WP=600/20=30\,\text{W}.

7. QuestionMultiple choice

What trade-off can an ideal simple machine provide?

Please select an answer first.

Correct answer: C

The correct answer is It can exchange force for distance or speed while conserving work.

  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: Ideal machines conserve work; a smaller input force may require a larger distance.
  3. Check units and conservation: The correct answer is It can exchange force for distance or speed while conserving work.

Ideal machines conserve work; a smaller input force may require a larger distance.

8. QuestionMultiple choice

What does electrical energy consumption depend on?

Please select an answer first.

Correct answer: D

The correct answer is Power and the time for which a device operates.

  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 transferred is E=PΔtE=P\Delta t, so both power and operating time matter.
  3. Check units and conservation: The correct answer is Power and the time for which a device operates.

Energy transferred is E=PΔtE=P\Delta t, so both power and operating time matter.

9. QuestionMultiple choice

A 100 N load is lifted 2 m in 4 s. What is the average useful power?

Please select an answer first.

Correct answer: A

The correct answer is 50 W50\,\text{W}.

  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: Useful work is W=Fd=100(2)=200 JW=Fd=100(2)=200\,\text{J}, so P=200/4=50 WP=200/4=50\,\text{W}.
  3. Check units and conservation: The correct answer is 50 W50\,\text{W}.

Useful work is W=Fd=100(2)=200 JW=Fd=100(2)=200\,\text{J}, so P=200/4=50 WP=200/4=50\,\text{W}.

10. QuestionMultiple choice

Why can a person produce high power for only a short time?

Please select an answer first.

Correct answer: B

The correct answer is Energy transfer rate can be high even when available energy and endurance are limited.

  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: Power describes rate, while fatigue and energy stores limit how long a high rate can be sustained.
  3. Check units and conservation: The correct answer is Energy transfer rate can be high even when available energy and endurance are limited.

Power describes rate, while fatigue and energy stores limit how long a high rate can be sustained.

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