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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 the first step when drawing a force diagram?

Please select an answer first.

Correct answer: A

The correct answer is Choose and isolate the object or system being analyzed.

  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 clear system boundary prevents forces from different objects from being mixed in one diagram.
  3. Check direction and units: The correct answer is Choose and isolate the object or system being analyzed.

A clear system boundary prevents forces from different objects from being mixed in one diagram.

2. QuestionMultiple choice

Why should a coordinate axis be chosen before solving Newton's second law?

Please select an answer first.

Correct answer: B

The correct answer is Signs and force components depend on the chosen directions.

  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 coordinate system allows ∑Fx=max\sum F_x=ma_x and ∑Fy=may\sum F_y=ma_y to be written consistently.
  3. Check direction and units: The correct answer is Signs and force components depend on the chosen directions.

A coordinate system allows ∑Fx=max\sum F_x=ma_x and ∑Fy=may\sum F_y=ma_y to be written consistently.

3. QuestionMultiple choice

What is a controlled variable in a force experiment?

Please select an answer first.

Correct answer: C

The correct answer is A condition held constant while the independent variable is changed.

  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: Keeping factors such as mass, surface, or angle fixed makes the test of the force relationship fair.
  3. Check direction and units: The correct answer is A condition held constant while the independent variable is changed.

Keeping factors such as mass, surface, or angle fixed makes the test of the force relationship fair.

4. QuestionMultiple choice

What does a plot of net force versus acceleration have as its slope?

Please select an answer first.

Correct answer: D

The correct answer is Mass.

  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 Fnet=maF_{net}=ma, a graph of force on the vertical axis versus acceleration on the horizontal axis has slope mm.
  3. Check direction and units: The correct answer is Mass.

From Fnet=maF_{net}=ma, a graph of force on the vertical axis versus acceleration on the horizontal axis has slope mm.

5. QuestionMultiple choice

What does a plot of acceleration versus net force show when mass is constant?

Please select an answer first.

Correct answer: A

The correct answer is A straight line with slope 1/m1/m.

  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: Rearranging Newton's second law gives a=Fnet/ma=F_{net}/m, so the slope is the reciprocal of mass.
  3. Check direction and units: The correct answer is A straight line with slope 1/m1/m.

Rearranging Newton's second law gives a=Fnet/ma=F_{net}/m, so the slope is the reciprocal of mass.

6. QuestionMultiple choice

Why should a measured friction coefficient be reported with appropriate uncertainty?

Please select an answer first.

Correct answer: B

The correct answer is The coefficient is estimated from measurements that have limitations and variation.

  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: Measurements and models have limits, so uncertainty communicates the range of reasonable values.
  3. Check direction and units: The correct answer is The coefficient is estimated from measurements that have limitations and variation.

Measurements and models have limits, so uncertainty communicates the range of reasonable values.

7. QuestionMultiple choice

What is a model assumption in an ideal pulley problem?

Please select an answer first.

Correct answer: C

The correct answer is The pulley and rope have negligible mass and the rope does not stretch.

  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: Ideal assumptions simplify tension and acceleration calculations and define the conditions of the model.
  3. Check direction and units: The correct answer is The pulley and rope have negligible mass and the rope does not stretch.

Ideal assumptions simplify tension and acceleration calculations and define the conditions of the model.

8. QuestionMultiple choice

What should a student do if a force diagram includes a force that does not act on the selected object?

Please select an answer first.

Correct answer: D

The correct answer is Remove it and redraw the diagram for the chosen system.

  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 should contain only external forces acting on the isolated object or system.
  3. Check direction and units: The correct answer is Remove it and redraw the diagram for the chosen system.

A free-body diagram should contain only external forces acting on the isolated object or system.

9. QuestionMultiple choice

What does a residual force indicate in a force balance?

Please select an answer first.

Correct answer: A

The correct answer is A nonzero net force that can produce acceleration.

  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: If the vector sum is not zero, Newton's second law predicts nonzero acceleration in the net-force direction.
  3. Check direction and units: The correct answer is A nonzero net force that can produce acceleration.

If the vector sum is not zero, Newton's second law predicts nonzero acceleration in the net-force direction.

10. QuestionMultiple choice

Why compare a model prediction with measured acceleration?

Please select an answer first.

Correct answer: B

The correct answer is The comparison tests how well the assumptions and force model describe the system.

  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: Agreement within uncertainty supports the model; systematic disagreement may reveal missing forces or invalid assumptions.
  3. Check direction and units: The correct answer is The comparison tests how well the assumptions and force model describe the system.

Agreement within uncertainty supports the model; systematic disagreement may reveal missing forces or invalid assumptions.

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