Lesson 9, Topic 5
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# Application of Newton’s Laws & Conservation of Momentum Laws

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### Topic Content:

• Recoil of a Gun
• Jet and Rocket Propulsion
• Why Walking Is Possible

### 1. Recoil of a Gun:

When a gun is fired, the bullet moves forward with a velocity of V1, and mass M1, if the gun has mass M2, it also moves with a velocity, V2. From conservation of momentum.

The momentum of the gun and bullet before and after firing is given as

Before firing

The gun and the bullet are both at rest, so the momentum (mv) of the gun and the bullet are both zero. So, the total momentum of the system before the bullet is fired is zero.

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