Chapter Exam

Chapter 6: How Forces Affect Motion — Online MCQ Test

Q: Which of the following is an example of a balanced force?

Answer: A. A book resting on a table — A book on a table remains at rest because the upward force balances its weight downward. The net force on the book is zero.

Q: The tendency of an object to resist change in its state of rest or motion is called:

Answer: C. Inertia — Inertia is the property of a body due to which it resists any change in its state of rest or uniform motion.

Q: A bus suddenly stops and the passengers fall forward. This happens due to:

Answer: A. Inertia of motion — The passengers' upper bodies tend to keep moving forward when the bus stops suddenly. This is due to inertia of motion.

Q: Two forces of equal magnitude act in opposite directions on an object. What is the most likely result?

Answer: B. The object experiences zero net force — Equal and opposite forces cancel each other, resulting in zero net force. Such forces are called balanced forces.

Q: A heavier object and a lighter object are moving with the same velocity. Which of the following is true?

Answer: C. The heavier object has greater momentum — Momentum = mass × velocity. For the same velocity, the object with greater mass has greater momentum.

SCIENCE · Grade 9 · CBSE(NCERT)

Practice Chapter 6: How Forces Affect Motion with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 9 SCIENCE. This chapter covers: Force Balanced Force Unbalanced Force Newton Laws Inertia Momentum Friction Acceleration Action Reaction Mass Understanding how forces influence motion through Newton's laws inerti.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: How Forces Affect Motion — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 9 SCIENCE — Chapter 6: How Forces Affect Motion, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is an example of a balanced force?

A. A book resting on a table ✓
B. A car starting to move
C. A falling stone
D. A ball being kicked

Answer: A. A book resting on a table
A book on a table remains at rest because the upward force balances its weight downward. The net force on the book is zero.

The tendency of an object to resist change in its state of rest or motion is called:

A. Momentum
B. Friction
C. Inertia ✓
D. Acceleration

Answer: C. Inertia
Inertia is the property of a body due to which it resists any change in its state of rest or uniform motion.

A bus suddenly stops and the passengers fall forward. This happens due to:

A. Inertia of motion ✓
B. Inertia of rest
C. Friction
D. Momentum conservation only

Answer: A. Inertia of motion
The passengers' upper bodies tend to keep moving forward when the bus stops suddenly. This is due to inertia of motion.

Two forces of equal magnitude act in opposite directions on an object. What is the most likely result?

A. The object must start moving
B. The object experiences zero net force ✓
C. The object's mass becomes zero
D. The object gains momentum automatically

Answer: B. The object experiences zero net force
Equal and opposite forces cancel each other, resulting in zero net force. Such forces are called balanced forces.

A heavier object and a lighter object are moving with the same velocity. Which of the following is true?

A. Both have the same momentum
B. The lighter object has greater momentum
C. The heavier object has greater momentum ✓
D. Momentum does not depend on mass

Answer: C. The heavier object has greater momentum
Momentum = mass × velocity. For the same velocity, the object with greater mass has greater momentum.