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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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1. 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 work when a constant force acts parallel to displacement?

Please select an answer first.

Correct answer: A

The correct answer is W=FdW=Fd.

  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 parallel to displacement, work equals force multiplied by displacement; generally W=Fdcos⁡θW=Fd\cos\theta.
  3. Check units and conservation: The correct answer is W=FdW=Fd.

For a force parallel to displacement, work equals force multiplied by displacement; generally W=Fdcos⁡θW=Fd\cos\theta.

2. QuestionMultiple choice

When is work done by a force positive?

Please select an answer first.

Correct answer: B

The correct answer is When the force has a component in the direction of displacement.

  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: Positive work transfers energy to the object and occurs when the force component along displacement is positive.
  3. Check units and conservation: The correct answer is When the force has a component in the direction of displacement.

Positive work transfers energy to the object and occurs when the force component along displacement is positive.

3. QuestionMultiple choice

What is the work done by a force perpendicular to displacement?

Please select an answer first.

Correct answer: C

The correct answer is Zero.

  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 W=Fdcos⁡θW=Fd\cos\theta and cos⁡90∘=0\cos 90^\circ=0, perpendicular force does no work.
  3. Check units and conservation: The correct answer is Zero.

Since W=Fdcos⁡θW=Fd\cos\theta and cos⁡90∘=0\cos 90^\circ=0, perpendicular force does no work.

4. QuestionMultiple choice

What does the net work on an object equal?

Please select an answer first.

Correct answer: D

The correct answer is The change in kinetic 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: The work-energy theorem states Wnet=ΔKW_{net}=\Delta K.
  3. Check units and conservation: The correct answer is The change in kinetic energy.

The work-energy theorem states Wnet=ΔKW_{net}=\Delta K.

5. QuestionMultiple choice

When is work done by a force negative?

Please select an answer first.

Correct answer: A

The correct answer is When the force component opposes the displacement.

  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 force opposite the displacement has cos⁡θ<0\cos\theta<0, so it removes kinetic energy through negative work.
  3. Check units and conservation: The correct answer is When the force component opposes the displacement.

A force opposite the displacement has cos⁡θ<0\cos\theta<0, so it removes kinetic energy through negative work.

6. QuestionMultiple choice

What does the area under a force-position graph represent?

Please select an answer first.

Correct answer: B

The correct answer is 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: The area under an FxF_x-versus-Δx graph is the integral of force over displacement, which is work.
  3. Check units and conservation: The correct answer is Work.

The area under an FxF_x-versus-Δx graph is the integral of force over displacement, which is work.

7. QuestionMultiple choice

What is the SI unit of work?

Please select an answer first.

Correct answer: C

The correct answer is The joule, equivalent to 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: One joule is one newton-meter of work when force and displacement are parallel.
  3. Check units and conservation: The correct answer is The joule, equivalent to N⋅m\text{N}\cdot\text{m}.

One joule is one newton-meter of work when force and displacement are parallel.

8. QuestionMultiple choice

How is work calculated for a variable force?

Please select an answer first.

Correct answer: D

The correct answer is By finding the area under the force-displacement curve.

  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 variable force, work is the integral W=∫Fx dxW=\int F_x\,dx, represented by area on the graph.
  3. Check units and conservation: The correct answer is By finding the area under the force-displacement curve.

For a variable force, work is the integral W=∫Fx dxW=\int F_x\,dx, represented by area on the graph.

9. QuestionMultiple choice

What work does gravity do on an object moving downward near Earth?

Please select an answer first.

Correct answer: A

The correct answer is Positive 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: Gravity and downward displacement point in the same direction, so gravity transfers energy to the object.
  3. Check units and conservation: The correct answer is Positive work.

Gravity and downward displacement point in the same direction, so gravity transfers energy to the object.

10. QuestionMultiple choice

What is the work done by an ideal spring from stretch xix_i to xfx_f?

Please select an answer first.

Correct answer: B

The correct answer is Ws=12k(xi2−xf2)W_s=\frac{1}{2}k(x_i^2-x_f^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: For spring force F=−kxF=-kx, the work done by the spring is the decrease in elastic potential energy.
  3. Check units and conservation: The correct answer is Ws=12k(xi2−xf2)W_s=\frac{1}{2}k(x_i^2-x_f^2).

For spring force F=−kxF=-kx, the work done by the spring is the decrease in elastic potential energy.

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