Before writing the situations first, we need to understand the meaning of law of conservation of momentum.
LAW OF CONSERVATION OF MOMENTUM – It states that when no external force is applied on a system then the momentum of the system does not changes, that is final momentum is equal to initial momentum. Also internal forces have no impact on momentum of the system.
1) Motion of rockets and jet engines
Rockets and jet engines also work on the law of conservation of momentum. In these hot gases produced by burning of fuel rush out with a large momentum, Due to this, these machines gain an equal and opposite momentum. This momentum enables the rockets and jet engines with very high velocities.
The system of gun and bullet
Before firing both gun and bullet are at rest, therefore momentum of the system is zero. When the bullet is fired the bullet moves forward and gun recoils back. The mass of the gun is very large as compared to the mass of the bullet, therefore the recoils velocity is very small as compared the velocity of the bullet.
2) Air filled balloons
In the air-filled balloon, balloon, and air inside form a kind of system. Initially when the system is at rest, so the momentum of the system is also zero. As soon as the balloon is set free air escapes out with some great velocity, balloon moves forward in the direction opposite to air rushing out.
3. Diwali crackers
When we lighten a cracker it is at rest so the initial momentum is zero but as soon as the firecracker bursts it gets divided into small pieces and each piece has different velocity and different mass but if we add every piece’s momentum it comes out to be zero.
4. Person Stuck on Ice Surface
When a person is in middle of ice surface it can get out by using it’s thing by throwing each one of it’s things in different direction with most velocity it can achieve as the initial momentum is zero hence to make the final momentum zero the person will get some momentum by achieving some velocity.
5. Pushing a person
When we push a person, we experience some force on us due to newton’s third law of motion but the velocity due to force is gained by the momentum that we obtained from the person while pushing him as the initial momentum was zero when both the person was still and when one pushes he imparts some momentum to other person so by law of conservation of momentum he will have to suffer the consequences.
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