1D Motion Class 9 Physics | Distance, Displacement, Speed & Velocity and Acceleration Explained”

📘 Story Book + 1D Motion Interactive Quiz

Read the animated story book pages, revise motion concepts, attempt the Assertion-Reason quiz, and check HOTS answers instantly.

📖 Animated Story Book

Cover Page

Tip: Click any page number to jump directly to that story page.

🚀 1D Motion – Assertion & Reason Quiz

Select the correct option and click submit to check your score instantly.

Question 1

Assertion: Distance is always positive.
Reason: Distance is a scalar quantity.

Both true, R explains A Both true, R not explanation A true, R false A false, R true

Question 2

Assertion: Displacement can be zero.
Reason: A body can return to its starting point.

Both true, R explains A Both true, R not explanation A true, R false A false, R true

Question 3

Assertion: Speed is always equal to velocity.
Reason: Speed has no direction.

Both true, R explains A Both true, R not explanation A true, R false A false, R true

Question 4

Assertion: Velocity can be negative.
Reason: Velocity has direction.

Both true, R explains A Both true, R not explanation A true, R false A false, R true

Question 5

Assertion: Acceleration can be zero.
Reason: Velocity may remain constant.

Both true, R explains A Both true, R not explanation A true, R false A false, R true

🧠 HOTS Questions

Click each question to reveal the answer.

1. Can distance be zero? When?

Yes, when the object does not move.

2. Give an example where displacement is zero but distance is not.

Walking in a circle and returning to the starting point.

3. Why is velocity important?

Velocity is important because it gives both speed and direction of motion.

4. What is uniform motion?

Uniform motion is motion with constant velocity.

5. Can acceleration be negative?

Yes, negative acceleration is called retardation.