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Scalars & Vectors | Week 15 Topics1 Quiz
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Equations of Motion | Week 23 Topics1 Quiz
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Projectile | Week 35 Topics1 Quiz
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Equilibrium of Forces I | Week 44 Topics
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Equilibrium of Forces II | Week 54 Topics1 Quiz
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Stability of a Body | Week 64 Topics1 Quiz
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Simple Harmonic Motion (SHM) | Week 74 Topics
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Speed, Velocity & Acceleration & Energy of Simple Harmonic Motion | Week 85 Topics1 Quiz
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Linear Momentum | Week 96 Topics1 Quiz
Application of Newton’s Laws & Conservation of Momentum Laws
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.
After firing
After the gun is fired, the bullet gets a velocity to the right, as shown in the diagram above. This means that the bullet now has momentum, M1 V1 , to the right. Since there was zero total momentum in the system
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