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Law of conservation of momentum Video Lecture | Physics for Grade 9

FAQs on Law of conservation of momentum Video Lecture - Physics for Grade 9

1. What is the law of conservation of momentum?

Ans. The law of conservation of momentum states that the total momentum of a closed system remains constant if no external forces act on it. In simpler terms, the total momentum before an event is equal to the total momentum after the event, as long as no external forces are involved.

2. How is momentum calculated?

Ans. Momentum is calculated by multiplying the mass of an object by its velocity. The formula for momentum (p) is given by p = m * v, where m represents the mass of the object and v represents its velocity.

3. What happens to the momentum when two objects collide?

Ans. When two objects collide, the total momentum before the collision is equal to the total momentum after the collision, as per the law of conservation of momentum. This means that the momentum of one object may decrease while the momentum of the other object increases, but the sum of their momenta remains the same.

4. How does the law of conservation of momentum apply to real-life situations?

Ans. The law of conservation of momentum applies to various real-life situations. For example, in a car crash, the total momentum of the colliding vehicles before the crash is equal to the total momentum after the crash, which helps determine the outcome of the collision. Similarly, in sports like billiards or bowling, the law of conservation of momentum is used to predict the motion of the balls after collisions.

5. Can momentum be lost in a closed system?

Ans. No, momentum cannot be lost in a closed system as long as no external forces act on it. The law of conservation of momentum ensures that the total momentum of a closed system remains constant. However, momentum can be transferred between objects within the system, resulting in changes in individual momenta.

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Sep 23, 2025 Last updated

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