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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 centripetal force?

Please select an answer first.

Correct answer: A

The correct answer is The net inward force required for circular 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: Centripetal force is the name for the inward net force; gravity, tension, friction, or a combination can provide it.
  3. Check direction and units: The correct answer is The net inward force required for circular motion.

Centripetal force is the name for the inward net force; gravity, tension, friction, or a combination can provide it.

2. QuestionMultiple choice

What is the centripetal acceleration magnitude?

Please select an answer first.

Correct answer: B

The correct answer is ac=v2ra_c=\frac{v^2}{r}.

  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 circular motion, inward acceleration has magnitude ac=v2ra_c=\frac{v^2}{r}.
  3. Check direction and units: The correct answer is ac=v2ra_c=\frac{v^2}{r}.

For circular motion, inward acceleration has magnitude ac=v2ra_c=\frac{v^2}{r}.

3. QuestionMultiple choice

If speed doubles in the same circular path, what happens to centripetal force?

Please select an answer first.

Correct answer: C

The correct answer is It becomes four times as large.

  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: Since Fc=mv2/rF_c=mv^2/r, doubling speed multiplies the force by 22=42^2=4.
  3. Check direction and units: The correct answer is It becomes four times as large.

Since Fc=mv2/rF_c=mv^2/r, doubling speed multiplies the force by 22=42^2=4.

4. QuestionMultiple choice

What provides the centripetal force for a car turning on a level road?

Please select an answer first.

Correct answer: D

The correct answer is Static friction between the tires and road.

  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 supplies the inward horizontal force needed for a turn when the road is level.
  3. Check direction and units: The correct answer is Static friction between the tires and road.

Static friction supplies the inward horizontal force needed for a turn when the road is level.

5. QuestionMultiple choice

What happens when an object in circular motion loses its inward force?

Please select an answer first.

Correct answer: A

The correct answer is It moves tangent to the circle at that instant.

  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: Without inward acceleration, inertia carries the object along the tangent to its previous path.
  3. Check direction and units: The correct answer is It moves tangent to the circle at that instant.

Without inward acceleration, inertia carries the object along the tangent to its previous path.

6. QuestionMultiple choice

What is the relationship between weight and mass near Earth's surface?

Please select an answer first.

Correct answer: B

The correct answer is W=mgW=mg.

  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: Weight is the gravitational force on a mass and equals mass times local gravitational acceleration.
  3. Check direction and units: The correct answer is W=mgW=mg.

Weight is the gravitational force on a mass and equals mass times local gravitational acceleration.

7. QuestionMultiple choice

What is apparent weight in an accelerating elevator?

Please select an answer first.

Correct answer: C

The correct answer is The normal force exerted by the floor on the person.

  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 scale measures the contact normal force, which can differ from mgmg when the elevator accelerates.
  3. Check direction and units: The correct answer is The normal force exerted by the floor on the person.

A scale measures the contact normal force, which can differ from mgmg when the elevator accelerates.

8. QuestionMultiple choice

What is terminal speed reached by a falling object?

Please select an answer first.

Correct answer: D

The correct answer is The speed at which drag balances weight and net force becomes 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: At terminal speed, the upward drag magnitude equals downward weight, so acceleration is zero.
  3. Check direction and units: The correct answer is The speed at which drag balances weight and net force becomes zero.

At terminal speed, the upward drag magnitude equals downward weight, so acceleration is zero.

9. QuestionMultiple choice

What does a free-body diagram for an object in vertical free fall include in the ideal model?

Please select an answer first.

Correct answer: A

The correct answer is Only the downward gravitational 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: When air resistance is ignored and no contact exists, gravity is the only external force.
  3. Check direction and units: The correct answer is Only the downward gravitational force.

When air resistance is ignored and no contact exists, gravity is the only external force.

10. QuestionMultiple choice

Why is gravity considered a universal force in Newtonian mechanics?

Please select an answer first.

Correct answer: B

The correct answer is It acts between masses and is not limited to physical contact.

  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: Gravitational interaction acts at a distance between masses, although its effect depends on separation and mass.
  3. Check direction and units: The correct answer is It acts between masses and is not limited to physical contact.

Gravitational interaction acts at a distance between masses, although its effect depends on separation and mass.

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