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Newton's first law of motion - Class 9, Science Video Lecture - CBSE/Schools
FAQs on Newton's first law of motion - Class 9, Science
| 1. What is Newton's first law of motion? |  |
Ans. Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will continue to move in a straight line with a constant speed, unless acted upon by an external force.
| 2. What is meant by inertia? | |
Ans. Inertia is the property of an object that resists any change in its state of motion. It is directly related to Newton's first law of motion. Objects with more mass have more inertia, meaning they are harder to set into motion or stop, while objects with less mass have less inertia.
| 3. Can you provide an example illustrating Newton's first law of motion? | |
Ans. Yes, for example, if you push a book on a table with a small force, the book will not move because of its inertia. However, if you push the book with a greater force, it will overcome the inertia and start moving. Similarly, if you suddenly stop a moving vehicle, the passengers inside tend to move forward due to their inertia.
| 4. How does Newton's first law of motion apply to everyday life? | |
Ans. Newton's first law of motion applies to everyday life in various ways. For instance, it explains why we feel a backward push when a moving vehicle comes to a sudden stop. It also explains why we need to wear seatbelts in vehicles to prevent being thrown forward in case of sudden braking. Additionally, it helps us understand why objects tend to fall off a moving vehicle or table when they are abruptly stopped or turned.
| 5. Can you explain how Newton's first law of motion relates to sports? | |
Ans. Certainly! Newton's first law of motion is relevant in various sports. For example, in cricket, a fielder needs to apply a force to catch a fast-moving ball to change its direction and bring it to rest. In basketball, when a player dribbles the ball, it continues to move in a straight line until an external force is applied to change its path. In all sports, inertia and the application of forces to overcome it play a significant role in the movements of players and objects.
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Apr 18, 2026 Last updated
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