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Important Questions

How Forces Affect Motion

CBSE · Class 9 · Science

Most important questions from How Forces Affect Motion for CBSE Class 9 Science board exam 2026. MCQs, short answer, and long answer questions with marks.

110 questions72 flashcards5 concepts

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110 Questions·
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Sample Questions

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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Frequently Asked Questions

What are the important topics in How Forces Affect Motion for CBSE Class 9 Science?
Key topics in How Forces Affect Motion include Classification of Plant Tissues, Classification of Plant Tissues, Complete Classification of Plant and Animal Tissues. These are the concepts CBSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in How Forces Affect Motion — CBSE Class 9 Science?
Understand the core concepts first, then work through the 110 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in How Forces Affect Motion?
There are 110 practice questions available for How Forces Affect Motion. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

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

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