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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 an isolated energy system?

Please select an answer first.

Correct answer: A

The correct answer is A system in which no net energy crosses the chosen boundary.

  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 an isolated system, energy can transform between forms but the total remains constant.
  3. Check units and conservation: The correct answer is A system in which no net energy crosses the chosen boundary.

For an isolated system, energy can transform between forms but the total remains constant.

2. QuestionMultiple choice

What does external work do to a system?

Please select an answer first.

Correct answer: B

The correct answer is It transfers energy across the system boundary.

  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: Work by an external force changes the system's energy according to the chosen boundary and sign convention.
  3. Check units and conservation: The correct answer is It transfers energy across the system boundary.

Work by an external force changes the system's energy according to the chosen boundary and sign convention.

3. QuestionMultiple choice

A roller coaster reaches a lower height with negligible friction. What happens to its speed?

Please select an answer first.

Correct answer: C

The correct answer is Its speed increases because gravitational potential energy becomes 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: With mechanical energy conserved, the decrease in mghmgh becomes an increase in KK.
  3. Check units and conservation: The correct answer is Its speed increases because gravitational potential energy becomes kinetic energy.

With mechanical energy conserved, the decrease in mghmgh becomes an increase in KK.

4. QuestionMultiple choice

How does a car's braking force affect its kinetic energy?

Please select an answer first.

Correct answer: D

The correct answer is Negative work by the brakes reduces 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 braking force opposes displacement, so it does negative work and transfers kinetic energy to thermal energy.
  3. Check units and conservation: The correct answer is Negative work by the brakes reduces kinetic energy.

The braking force opposes displacement, so it does negative work and transfers kinetic energy to thermal energy.

5. QuestionMultiple choice

When is work by a force zero even if the object moves?

Please select an answer first.

Correct answer: A

The correct answer is When the force is perpendicular to 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: The dot product W=F⃗⋅d⃗W=\vec F\cdot\vec d is zero for perpendicular force and displacement.
  3. Check units and conservation: The correct answer is When the force is perpendicular to the displacement.

The dot product W=F⃗⋅d⃗W=\vec F\cdot\vec d is zero for perpendicular force and displacement.

6. QuestionMultiple choice

What is an energy transfer?

Please select an answer first.

Correct answer: B

The correct answer is Energy moving between objects or across a system boundary.

  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 can transfer by work, heat, radiation, or other interactions while total energy is conserved.
  3. Check units and conservation: The correct answer is Energy moving between objects or across a system boundary.

Energy can transfer by work, heat, radiation, or other interactions while total energy is conserved.

7. QuestionMultiple choice

Why does sliding friction warm surfaces?

Please select an answer first.

Correct answer: C

The correct answer is Mechanical energy is transferred into internal 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 transforms organized mechanical energy into microscopic internal energy and raises thermal energy.
  3. Check units and conservation: The correct answer is Mechanical energy is transferred into internal thermal energy.

Friction transforms organized mechanical energy into microscopic internal energy and raises thermal energy.

8. QuestionMultiple choice

A spring launcher sends a cart forward. What is the initial energy transformation?

Please select an answer first.

Correct answer: D

The correct answer is Elastic potential energy becomes 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 compressed spring stores elastic energy, which can transfer to the cart's kinetic energy.
  3. Check units and conservation: The correct answer is Elastic potential energy becomes kinetic energy.

The compressed spring stores elastic energy, which can transfer to the cart's kinetic energy.

9. QuestionMultiple choice

What does the area under a power-time graph represent?

Please select an answer first.

Correct answer: A

The correct answer is Energy transferred.

  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 is ∫P dt\int P\,dt, which gives transferred energy.
  3. Check units and conservation: The correct answer is Energy transferred.

The area is ∫P dt\int P\,dt, which gives transferred energy.

10. QuestionMultiple choice

Why must the system boundary be stated in an energy problem?

Please select an answer first.

Correct answer: B

The correct answer is It determines which transfers are external and which transformations occur inside the system.

  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 accounting depends on whether objects, forces, and reservoirs are included inside or outside the system.
  3. Check units and conservation: The correct answer is It determines which transfers are external and which transformations occur inside the system.

Energy accounting depends on whether objects, forces, and reservoirs are included inside or outside the system.

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