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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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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 is an isolated collision system?

Please select an answer first.

Correct answer: A

The correct answer is A system with negligible net external impulse during the collision.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Momentum conservation applies when external impulse is negligible compared with the internal collision impulses.
  3. Check signs and units: The correct answer is A system with negligible net external impulse during the collision.

Momentum conservation applies when external impulse is negligible compared with the internal collision impulses.

2. QuestionMultiple choice

Why can internal forces change the momentum of individual objects but not total system momentum?

Please select an answer first.

Correct answer: B

The correct answer is Internal impulses occur in equal and opposite pairs.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Newton's third law makes internal impulse contributions cancel in the system total.
  3. Check signs and units: The correct answer is Internal impulses occur in equal and opposite pairs.

Newton's third law makes internal impulse contributions cancel in the system total.

3. QuestionMultiple choice

What is a momentum diagram useful for?

Please select an answer first.

Correct answer: C

The correct answer is Showing initial and final momentum vectors for objects in a process.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Momentum diagrams make direction and vector addition visible before equations are written.
  3. Check signs and units: The correct answer is Showing initial and final momentum vectors for objects in a process.

Momentum diagrams make direction and vector addition visible before equations are written.

4. QuestionMultiple choice

What happens to total momentum when an external impulse acts on a system?

Please select an answer first.

Correct answer: D

The correct answer is Total momentum changes by the external 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 system relationship is J⃗ext=Δp⃗system\vec J_{ext}=\Delta\vec p_{system}.
  3. Check signs and units: The correct answer is Total momentum changes by the external impulse.

The system relationship is J⃗ext=Δp⃗system\vec J_{ext}=\Delta\vec p_{system}.

5. QuestionMultiple choice

A rocket accelerates in space by expelling gas. Which principle explains the motion?

Please select an answer first.

Correct answer: A

The correct answer is Conservation of 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: Gas expelled backward carries momentum, giving the rocket forward momentum in the opposite direction.
  3. Check signs and units: The correct answer is Conservation of momentum.

Gas expelled backward carries momentum, giving the rocket forward momentum in the opposite direction.

6. QuestionMultiple choice

What is the main difference between an elastic and an inelastic collision?

Please select an answer first.

Correct answer: B

The correct answer is Kinetic energy is conserved in an ideal elastic collision but not generally in an inelastic one.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Both can conserve momentum in an isolated system, but kinetic energy conservation distinguishes the ideal elastic case.
  3. Check signs and units: The correct answer is Kinetic energy is conserved in an ideal elastic collision but not generally in an inelastic one.

Both can conserve momentum in an isolated system, but kinetic energy conservation distinguishes the ideal elastic case.

7. QuestionMultiple choice

Why should velocities be assigned signs in one-dimensional collision problems?

Please select an answer first.

Correct answer: C

The correct answer is Signs represent direction and are required for vector momentum conservation.

  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 a positive axis lets p=mvp=mv include forward and backward motion consistently.
  3. Check signs and units: The correct answer is Signs represent direction and are required for vector momentum conservation.

Using a positive axis lets p=mvp=mv include forward and backward motion consistently.

8. QuestionMultiple choice

What is the final velocity of two masses that stick together determined by?

Please select an answer first.

Correct answer: D

The correct answer is Total initial momentum divided by total combined mass.

  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 a perfectly inelastic collision, vf=m1v1i+m2v2im1+m2v_f=\frac{m_1v_{1i}+m_2v_{2i}}{m_1+m_2}.
  3. Check signs and units: The correct answer is Total initial momentum divided by total combined mass.

For a perfectly inelastic collision, vf=m1v1i+m2v2im1+m2v_f=\frac{m_1v_{1i}+m_2v_{2i}}{m_1+m_2}.

9. QuestionMultiple choice

What does a collision impulse do to an object's motion?

Please select an answer first.

Correct answer: A

The correct answer is It changes the object's 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 is the vector change in momentum and may increase, decrease, or reverse velocity.
  3. Check signs and units: The correct answer is It changes the object's momentum.

Impulse is the vector change in momentum and may increase, decrease, or reverse velocity.

10. QuestionMultiple choice

Why can a collision have conserved momentum but reduced kinetic energy?

Please select an answer first.

Correct answer: B

The correct answer is Kinetic energy can transfer to deformation, sound, and thermal energy while total momentum remains conserved.

  1. Identify the momentum system: Determine the objects, directions, initial and final velocities, and whether external impulse is negligible.
  2. Apply the momentum relationship: Momentum and kinetic energy are different quantities; an isolated inelastic collision can conserve momentum while transferring kinetic energy to internal forms.
  3. Check signs and units: The correct answer is Kinetic energy can transfer to deformation, sound, and thermal energy while total momentum remains conserved.

Momentum and kinetic energy are different quantities; an isolated inelastic collision can conserve momentum while transferring kinetic energy to internal forms.

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