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Important Questions

How Forces Affect Motion — Important Questions

CBSE · Class 9 · Science

110 important questions from How Forces Affect Motion for CBSE Class 9 Science, with answers. Part of the CBSE Class 9 Science syllabus.

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110 Questions·
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Important Questions from How Forces Affect Motion

1multiple choice
3 marks

A system has two boxes of masses 3 kg and 5 kg on a frictionless surface. If an external force of 16 N pulls the system, what is the acceleration of the system?

Show answer

2 m/s^2

For connected objects, treat them as one system. Total mass = 3 + 5 = 8 kg. So a = F/(m1 + m2) = 16/8 = 2 m/s^2.

2multiple choice
3 marks

A system of two connected boxes has masses 4 kg and 6 kg. If the external force is 20 N and the surface is frictionless, what is the acceleration?

Show answer

2 m/s^2

The total mass is 4 + 6 = 10 kg. Using a = F/(m1 + m2), a = 20/10 = 2 m/s^2.

3multiple choice
3 marks

A 30 kg barbell is held steady. Using g = 9.8 m/s^2, what upward force must balance its weight?

Show answer

294 N upward

Weight is F = mg = 30 × 9.8 = 294 N downward. To keep it steady, an equal upward force of 294 N is needed.

4multiple choice
3 marks

A force of 1 N acts on an object of mass 0.5 kg. What acceleration does the object get, and what would the force be if the same object had acceleration 4 m/s^2?

Show answer

2 m/s^2, then 2 N

First, a = F/m = 1/0.5 = 2 m/s^2. Then for the same mass, F = ma = 0.5 × 4 = 2 N.

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What are the important topics in How Forces Affect Motion for CBSE Class 9 Science?
Key topics in How Forces Affect Motion include Concept of Force, Balanced and Unbalanced Forces, Friction and Motion, Newton's First Law of Motion and Inertia. Study these first, then practise questions on each for Class 9 exams.
How many important questions are there in How Forces Affect Motion?
Super Tutor has 110 practice questions for How Forces Affect Motion, including multiple choice, true false, multiple correct, numerical questions. A sample with answers is on this page.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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