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Momentum Practice Tests

These Grade 11 Science practice tests examine linear momentum, impulse, momentum conservation, elastic and inelastic collisions, recoil, center of mass, force-time graphs, and experimental data.

Skills covered

  • Calculating vector momentum from mass and velocity and tracking direction with signs
  • Applying impulse–momentum relationships and interpreting force-time graph areas
  • Solving isolated collisions, perfectly inelastic collisions, elastic collisions, recoil, and center-of-mass motion
  • Distinguishing momentum conservation from kinetic-energy conservation and identifying external impulse
  • Planning momentum experiments, evaluating calibration, uncertainty, repeated trials, graphs, and system boundaries

How to use these practice tests

Choose the system and positive direction first. Write initial and final momentum as vectors, check whether external impulse is negligible, and compare the units and direction of the result.

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

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3. Test

Grade 11 Momentum Practice Tests

Practice Grade 11 Science questions about linear momentum, impulse, momentum conservation, collisions, recoil, force-time graphs, and experimental analysis.

Choose the best answer. Define the system, assign directions, use vector momentum, account for external impulse, and check units.

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

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

Please select an answer first.

Correct answer: A

The correct answer is Impulse.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: The area is ∫F dt\int F\,dt, which equals impulse and therefore change in momentum.
  3. Check signs and units: The correct answer is Impulse.

The area is ∫F dt\int F\,dt, which equals impulse and therefore change in momentum.

2. QuestionMultiple choice

A constant 10 N force acts for 0.5 s. What impulse does it deliver?

Please select an answer first.

Correct answer: B

The correct answer is 5 N⋅s5\,\text{N}\cdot\text{s}.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: For constant force, J=FΔt=(10)(0.5)=5 N⋅sJ=F\Delta t=(10)(0.5)=5\,\text{N}\cdot\text{s}.
  3. Check signs and units: The correct answer is 5 N⋅s5\,\text{N}\cdot\text{s}.

For constant force, J=FΔt=(10)(0.5)=5 N⋅sJ=F\Delta t=(10)(0.5)=5\,\text{N}\cdot\text{s}.

3. QuestionMultiple choice

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

Please select an answer first.

Correct answer: C

The correct answer is Net force.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: The slope is Δp/Δt\Delta p/\Delta t, which equals net force.
  3. Check signs and units: The correct answer is Net force.

The slope is Δp/Δt\Delta p/\Delta t, which equals net force.

4. QuestionMultiple choice

What does a positive impulse indicate in one dimension?

Please select an answer first.

Correct answer: D

The correct answer is A positive change in momentum.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Impulse has direction and its sign matches the direction of the momentum change relative to the chosen axis.
  3. Check signs and units: The correct answer is A positive change in momentum.

Impulse has direction and its sign matches the direction of the momentum change relative to the chosen axis.

5. QuestionMultiple choice

Why are airbags effective in collisions?

Please select an answer first.

Correct answer: A

The correct answer is They increase the time over which the passenger's momentum changes.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: For the same momentum change, a longer stopping time lowers average force.
  3. Check signs and units: The correct answer is They increase the time over which the passenger's momentum changes.

For the same momentum change, a longer stopping time lowers average force.

6. QuestionMultiple choice

What is the average force if impulse is 40 N s over 2 s?

Please select an answer first.

Correct answer: B

The correct answer is 20 N20\,\text{N}.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Using Favg=J/ΔtF_{avg}=J/\Delta t, Favg=40/2=20 NF_{avg}=40/2=20\,\text{N}.
  3. Check signs and units: The correct answer is 20 N20\,\text{N}.

Using Favg=J/ΔtF_{avg}=J/\Delta t, Favg=40/2=20 NF_{avg}=40/2=20\,\text{N}.

7. QuestionMultiple choice

How does a force-time graph show a softer collision?

Please select an answer first.

Correct answer: C

The correct answer is The same momentum change occurs over a longer time with a lower peak force.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: A broader, lower force-time profile can have the same area and impulse while reducing peak force.
  3. Check signs and units: The correct answer is The same momentum change occurs over a longer time with a lower peak force.

A broader, lower force-time profile can have the same area and impulse while reducing peak force.

8. QuestionMultiple choice

What is the impulse from a force that is perpendicular to a chosen one-dimensional momentum direction?

Please select an answer first.

Correct answer: D

The correct answer is Its component along that direction is zero.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Only the component of impulse along the selected momentum axis changes that component of momentum.
  3. Check signs and units: The correct answer is Its component along that direction is zero.

Only the component of impulse along the selected momentum axis changes that component of momentum.

9. QuestionMultiple choice

What is the relationship between impulse and momentum change in vector form?

Please select an answer first.

Correct answer: A

The correct answer is J⃗=p⃗f−p⃗i\vec J=\vec p_f-\vec p_i.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Impulse is the vector difference between final and initial momentum.
  3. Check signs and units: The correct answer is J⃗=p⃗f−p⃗i\vec J=\vec p_f-\vec p_i.

Impulse is the vector difference between final and initial momentum.

10. QuestionMultiple choice

Why can a short, high force produce the same impulse as a long, low force?

Please select an answer first.

Correct answer: B

The correct answer is The areas under their force-time graphs can be equal.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Impulse is the area under the force-time curve, so different force-time profiles can have equal area.
  3. Check signs and units: The correct answer is The areas under their force-time graphs can be equal.

Impulse is the area under the force-time curve, so different force-time profiles can have equal area.

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