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Newton's Laws Introduction Practice Tests

These Grade 8 Science practice tests cover Newton's First, Second, and Third Laws, inertia, balanced and unbalanced forces, net force, F = ma, acceleration, action-reaction pairs, force diagrams, and safety applications.

Skills covered

  • Explaining inertia and constant velocity with Newton's First Law
  • Using F = ma to connect force, mass, and acceleration
  • Identifying action-reaction pairs on different interacting objects
  • Reading force diagrams and calculating net force and acceleration
  • Applying Newton's Laws to vehicles, sports, rockets, walking, and safety equipment

How to use these practice tests

First identify the object being analyzed and draw the forces acting on it. Add the forces with direction, decide whether the net force is zero, and then apply the appropriate Newton law or F = ma relationship.

For more Grade 8 Science practice, return to the Grade 8 Science category.

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1. Test

Grade 8 Newtons Laws Introduction Practice Tests

Practice Grade 8 Science questions about Newtons First, Second, and Third Laws, inertia, net force, acceleration, force pairs, diagrams, and applications.

Choose the best answer for each question. Identify the Newton law, track force directions and objects, and use F = ma when calculation is needed.

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

What does Newtons First Law state?

Please select an answer first.

Correct answer: A

The correct answer is An object keeps its state of motion unless an unbalanced force acts on it..

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

The First Law describes inertia and the tendency of an object to resist a change in motion.

2. QuestionMultiple choice

What is inertia?

Please select an answer first.

Correct answer: B

The correct answer is The tendency of an object to resist a change in motion.

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

Inertia is resistance to changes in motion and increases as mass increases.

3. QuestionMultiple choice

A ball rests on a table. Which statement best applies Newtons First Law?

Please select an answer first.

Correct answer: C

The correct answer is The ball remains at rest because the upward support force balances its downward weight..

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

The net force on the resting ball is zero, so its state of motion remains unchanged.

4. QuestionMultiple choice

A spacecraft moves through empty space at constant velocity. What is the net force in the idealized situation?

Please select an answer first.

Correct answer: D

The correct answer is Zero.

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

Constant velocity means no acceleration, so the net force is zero.

5. QuestionMultiple choice

Why does a seat belt protect a passenger when a car stops?

Please select an answer first.

Correct answer: A

The correct answer is It provides an external force that changes the passengers forward motion..

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

Inertia would keep the passenger moving forward, so the seat belt supplies the force needed to slow the passenger.

6. QuestionMultiple choice

What do balanced forces imply about acceleration?

Please select an answer first.

Correct answer: B

The correct answer is The net force is zero, so acceleration is zero..

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

Newton laws connect acceleration to net force, so zero net force means no change in velocity.

7. QuestionMultiple choice

What do unbalanced forces cause?

Please select an answer first.

Correct answer: C

The correct answer is A change in velocity, such as a change in speed or direction.

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

An unbalanced net force produces acceleration and therefore changes velocity.

8. QuestionMultiple choice

Which object has the greatest inertia?

Please select an answer first.

Correct answer: D

The correct answer is A fully loaded truck.

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

Greater mass means greater inertia, so the loaded truck resists motion changes most.

9. QuestionMultiple choice

Why does friction eventually stop a sliding book?

Please select an answer first.

Correct answer: A

The correct answer is Friction acts opposite the books motion and creates a net force that slows it..

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

The opposing friction force creates acceleration opposite the direction of motion.

10. QuestionMultiple choice

Which example best demonstrates inertia?

Please select an answer first.

Correct answer: B

The correct answer is A passenger leans forward when a bus stops suddenly..

  1. Identify the law or force: Decide whether the situation demonstrates inertia, the force-mass-acceleration relationship, or an action-reaction pair.
  2. Track the objects and directions: List the forces, identify which object receives each force, and determine the net force and direction when needed.
  3. Apply the equation or model: Use F = ma, a force diagram, data, or a real-world example to check that the explanation matches Newton law.

The passenger continues moving forward because the body resists the sudden change in motion.

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