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Newton's Laws Practice Tests

These Grade 11 Science practice tests examine Newton's three laws, inertia, net force, free-body diagrams, normal force, tension, friction, inclines, circular motion, gravity, drag, and experimental models.

Skills covered

  • Explaining inertia, force pairs, Newton's second law, equilibrium, and acceleration
  • Drawing and interpreting free-body diagrams with weight, normal force, tension, friction, drag, and applied forces
  • Resolving force components on horizontal surfaces and inclines and solving connected-object systems
  • Applying centripetal force, circular motion, gravitational force, apparent weight, and terminal speed models
  • Planning force experiments, interpreting graph slopes, evaluating uncertainty, and checking model assumptions

How to use these practice tests

Choose the system first, draw only the external forces, define positive directions, and write the component equations before substituting numbers.

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

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Grade 11 Newtons Laws Practice Tests

Practice Grade 11 Science questions about Newton's three laws, inertia, net force, free-body diagrams, normal force, tension, friction, circular motion, gravity, and models.

Choose the best answer. Isolate the system, draw or interpret the force diagram, apply \(\vec F_{net}=m\vec a\), and check direction and units.

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

What is static friction?

Please select an answer first.

Correct answer: A

The correct answer is Friction that prevents surfaces from beginning to slide.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: Static friction adjusts up to a maximum value to oppose the tendency of relative motion.
  3. Check direction and units: The correct answer is Friction that prevents surfaces from beginning to slide.

Static friction adjusts up to a maximum value to oppose the tendency of relative motion.

2. QuestionMultiple choice

What is kinetic friction?

Please select an answer first.

Correct answer: B

The correct answer is Friction that opposes sliding between surfaces.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: Kinetic friction acts while surfaces slide and is often modeled as fk=μkNf_k=\mu_k N.
  3. Check direction and units: The correct answer is Friction that opposes sliding between surfaces.

Kinetic friction acts while surfaces slide and is often modeled as fk=μkNf_k=\mu_k N.

3. QuestionMultiple choice

What determines the maximum static friction in a simple model?

Please select an answer first.

Correct answer: C

The correct answer is fs,max=μsNf_{s,max}=\mu_s N.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: The coefficient of static friction and normal force determine the maximum possible static friction.
  3. Check direction and units: The correct answer is fs,max=μsNf_{s,max}=\mu_s N.

The coefficient of static friction and normal force determine the maximum possible static friction.

4. QuestionMultiple choice

On a frictionless incline, which component of weight pulls an object down the slope?

Please select an answer first.

Correct answer: D

The correct answer is mgsin⁡θmg\sin\theta.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: For an incline angle θ\theta measured from horizontal, the component parallel to the slope is mgsin⁡θmg\sin\theta.
  3. Check direction and units: The correct answer is mgsin⁡θmg\sin\theta.

For an incline angle θ\theta measured from horizontal, the component parallel to the slope is mgsin⁡θmg\sin\theta.

5. QuestionMultiple choice

What is the direction of friction on a sliding object?

Please select an answer first.

Correct answer: A

The correct answer is Opposite the relative sliding motion.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: Friction opposes relative motion between surfaces, not necessarily the object's overall acceleration direction.
  3. Check direction and units: The correct answer is Opposite the relative sliding motion.

Friction opposes relative motion between surfaces, not necessarily the object's overall acceleration direction.

6. QuestionMultiple choice

A box slides at constant velocity across a horizontal floor. What is the net horizontal force?

Please select an answer first.

Correct answer: B

The correct answer is Zero.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: Constant velocity means zero acceleration, so horizontal applied force and kinetic friction balance.
  3. Check direction and units: The correct answer is Zero.

Constant velocity means zero acceleration, so horizontal applied force and kinetic friction balance.

7. QuestionMultiple choice

What happens to normal force for a stationary box on a horizontal surface when no vertical forces other than weight act?

Please select an answer first.

Correct answer: C

The correct answer is It equals the box's weight in magnitude.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: Vertical equilibrium gives N−mg=0N-mg=0, so N=mgN=mg.
  3. Check direction and units: The correct answer is It equals the box's weight in magnitude.

Vertical equilibrium gives N−mg=0N-mg=0, so N=mgN=mg.

8. QuestionMultiple choice

For two masses connected by an ideal rope over an ideal pulley, what is shared by the masses?

Please select an answer first.

Correct answer: D

The correct answer is The rope tension magnitude and the acceleration magnitude.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: An inextensible rope gives equal acceleration magnitudes, and an ideal rope gives the same tension throughout.
  3. Check direction and units: The correct answer is The rope tension magnitude and the acceleration magnitude.

An inextensible rope gives equal acceleration magnitudes, and an ideal rope gives the same tension throughout.

9. QuestionMultiple choice

Why can an object on an incline accelerate even if its speed is initially zero?

Please select an answer first.

Correct answer: A

The correct answer is A component of gravity can produce a nonzero net force along the slope.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: Instantaneous speed can be zero while acceleration is nonzero if an unbalanced force acts.
  3. Check direction and units: The correct answer is A component of gravity can produce a nonzero net force along the slope.

Instantaneous speed can be zero while acceleration is nonzero if an unbalanced force acts.

10. QuestionMultiple choice

What is drag force?

Please select an answer first.

Correct answer: B

The correct answer is A force from a fluid that opposes motion through the fluid.

  1. Identify the force system: Choose the object or system, list external forces, and determine the motion or equilibrium condition.
  2. Apply Newton law reasoning: Air resistance and water resistance are drag forces whose size can depend on speed, shape, and fluid conditions.
  3. Check direction and units: The correct answer is A force from a fluid that opposes motion through the fluid.

Air resistance and water resistance are drag forces whose size can depend on speed, shape, and fluid conditions.

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