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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 a free-body diagram?

Please select an answer first.

Correct answer: A

The correct answer is A diagram showing the external forces acting on a selected object.

  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: A free-body diagram isolates one object and represents each relevant external force with a labeled vector.
  3. Check direction and units: The correct answer is A diagram showing the external forces acting on a selected object.

A free-body diagram isolates one object and represents each relevant external force with a labeled vector.

2. QuestionMultiple choice

What is the normal force?

Please select an answer first.

Correct answer: B

The correct answer is A contact force perpendicular to a surface.

  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 normal force is perpendicular to the contact surface and adjusts according to the other forces and motion.
  3. Check direction and units: The correct answer is A contact force perpendicular to a surface.

The normal force is perpendicular to the contact surface and adjusts according to the other forces and motion.

3. QuestionMultiple choice

What is tension in an ideal rope?

Please select an answer first.

Correct answer: C

The correct answer is A pulling force transmitted along the rope.

  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 ideal rope transmits tension along its length and pulls on the objects attached to it.
  3. Check direction and units: The correct answer is A pulling force transmitted along the rope.

An ideal rope transmits tension along its length and pulls on the objects attached to it.

4. QuestionMultiple choice

What is the net force on a box pushed right with 30 N while friction acts left with 10 N?

Please select an answer first.

Correct answer: D

The correct answer is 20 N to the right.

  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: Taking right as positive, Fnet=30−10=20 NF_{net}=30-10=20\,\text{N} to the right.
  3. Check direction and units: The correct answer is 20 N to the right.

Taking right as positive, Fnet=30−10=20 NF_{net}=30-10=20\,\text{N} to the right.

5. QuestionMultiple choice

What does a balanced-force diagram show?

Please select an answer first.

Correct answer: A

The correct answer is Forces whose vector sum 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: Balanced forces produce zero net force and therefore zero acceleration.
  3. Check direction and units: The correct answer is Forces whose vector sum is zero.

Balanced forces produce zero net force and therefore zero acceleration.

6. QuestionMultiple choice

If two horizontal forces on an object are equal and opposite, what is their 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: Equal opposite vectors add to zero in the horizontal direction.
  3. Check direction and units: The correct answer is Zero.

Equal opposite vectors add to zero in the horizontal direction.

7. QuestionMultiple choice

What happens to acceleration if net force doubles while mass stays constant?

Please select an answer first.

Correct answer: C

The correct answer is Acceleration doubles.

  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: From a=Fnet/ma=F_{net}/m, acceleration is directly proportional to net force when mass is fixed.
  3. Check direction and units: The correct answer is Acceleration doubles.

From a=Fnet/ma=F_{net}/m, acceleration is directly proportional to net force when mass is fixed.

8. QuestionMultiple choice

What happens to acceleration if mass doubles while net force stays constant?

Please select an answer first.

Correct answer: D

The correct answer is Acceleration is halved.

  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: From a=Fnet/ma=F_{net}/m, doubling mass halves acceleration for the same net force.
  3. Check direction and units: The correct answer is Acceleration is halved.

From a=Fnet/ma=F_{net}/m, doubling mass halves acceleration for the same net force.

9. QuestionMultiple choice

Why must force vectors be added with direction?

Please select an answer first.

Correct answer: A

The correct answer is Opposite directions can cancel or reduce the net force.

  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: Net force is a vector sum, so signs and components determine the resulting acceleration.
  3. Check direction and units: The correct answer is Opposite directions can cancel or reduce the net force.

Net force is a vector sum, so signs and components determine the resulting acceleration.

10. QuestionMultiple choice

What is equilibrium in translational motion?

Please select an answer first.

Correct answer: B

The correct answer is The net force is zero and acceleration 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: An object in translational equilibrium may be at rest or move with constant velocity.
  3. Check direction and units: The correct answer is The net force is zero and acceleration is zero.

An object in translational equilibrium may be at rest or move with constant velocity.

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