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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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1. Test

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 does Newton's first law describe?

Please select an answer first.

Correct answer: A

The correct answer is Inertia and constant velocity when net force 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: Newton's first law states that an object remains at rest or moves with constant velocity unless a net external force acts on it.
  3. Check direction and units: The correct answer is Inertia and constant velocity when net force is zero.

Newton's first law states that an object remains at rest or moves with constant velocity unless a net external force acts on it.

2. QuestionMultiple choice

What is the mathematical form of Newton's second law?

Please select an answer first.

Correct answer: B

The correct answer is F⃗net=ma⃗\vec F_{net}=m\vec a.

  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 vector net force equals mass times acceleration, so acceleration points in the direction of the net force.
  3. Check direction and units: The correct answer is F⃗net=ma⃗\vec F_{net}=m\vec a.

The vector net force equals mass times acceleration, so acceleration points in the direction of the net force.

3. QuestionMultiple choice

What does Newton's third law state?

Please select an answer first.

Correct answer: C

The correct answer is Interacting objects exert equal-magnitude, opposite-direction forces on each other.

  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 action-reaction pair acts on different objects and has equal magnitude with opposite direction.
  3. Check direction and units: The correct answer is Interacting objects exert equal-magnitude, opposite-direction forces on each other.

The action-reaction pair acts on different objects and has equal magnitude with opposite direction.

4. QuestionMultiple choice

Why does a passenger move forward when a car stops suddenly?

Please select an answer first.

Correct answer: D

The correct answer is The passenger's inertia tends to maintain the previous velocity.

  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 body tends to continue moving while the car slows, which is an application of Newton's first law.
  3. Check direction and units: The correct answer is The passenger's inertia tends to maintain the previous velocity.

The body tends to continue moving while the car slows, which is an application of Newton's first law.

5. QuestionMultiple choice

If the net force on an object is zero, what can be true?

Please select an answer first.

Correct answer: A

The correct answer is The object can be at rest or move with constant velocity.

  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: Zero net force means zero acceleration, but individual forces may still act and balance.
  3. Check direction and units: The correct answer is The object can be at rest or move with constant velocity.

Zero net force means zero acceleration, but individual forces may still act and balance.

6. QuestionMultiple choice

Why do action and reaction forces not cancel an object's acceleration?

Please select an answer first.

Correct answer: B

The correct answer is They act on different objects.

  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: Newton's third-law forces are on separate objects, so they are not a pair on one object's force diagram.
  3. Check direction and units: The correct answer is They act on different objects.

Newton's third-law forces are on separate objects, so they are not a pair on one object's force diagram.

7. QuestionMultiple choice

What is inertia?

Please select an answer first.

Correct answer: C

The correct answer is An object's resistance to changes in its 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: Mass measures inertia: larger mass means greater resistance to a change in velocity.
  3. Check direction and units: The correct answer is An object's resistance to changes in its motion.

Mass measures inertia: larger mass means greater resistance to a change in velocity.

8. QuestionMultiple choice

A force of 20 N acts on a 5 kg object with no other net forces. What is its acceleration?

Please select an answer first.

Correct answer: D

The correct answer is 4 m/s24\,\text{m/s}^2.

  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: Using a=Fnet/ma=F_{net}/m, a=20/5=4 m/s2a=20/5=4\,\text{m/s}^2.
  3. Check direction and units: The correct answer is 4 m/s24\,\text{m/s}^2.

Using a=Fnet/ma=F_{net}/m, a=20/5=4 m/s2a=20/5=4\,\text{m/s}^2.

9. QuestionMultiple choice

What is a force?

Please select an answer first.

Correct answer: A

The correct answer is An interaction that can change an object's 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: Force is a vector interaction measured in newtons that can produce acceleration.
  3. Check direction and units: The correct answer is An interaction that can change an object's motion.

Force is a vector interaction measured in newtons that can produce acceleration.

10. QuestionMultiple choice

What is the SI unit of force?

Please select an answer first.

Correct answer: B

The correct answer is The newton, equivalent to kg⋅m/s2\text{kg}\cdot\text{m/s}^2.

  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 F=maF=ma, one newton is one kilogram meter per second squared.
  3. Check direction and units: The correct answer is The newton, equivalent to kg⋅m/s2\text{kg}\cdot\text{m/s}^2.

From F=maF=ma, one newton is one kilogram meter per second squared.

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