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Applications of Law of Conservation of Momentum
When a bullet is fired from a gun, the gases produced in the barrel exerts a tremendous force on the bullet (action force). As a result, the bullet moves forward with a great velocity called the muzzle velocity. The bullet at the same time exerts an equal force on the gun in the opposite direction (reaction force). Due to this the gun moves backwards. This backward motion of the gun is called the recoil of the gun. The velocity with which the gun moves backwards is called the recoil velocity.
Recoil of Gun
Let 'M' be the mass of the gun and m that of the bullet. Before firing both are at rest. After firing let 'V' be the velocity of the gun and 'v' that of the bullet. By law of conservation of linear momentum,
initial momentum of gun and bullet = final momentum of gun and bullet.
The initial momentum of the gun and the bullet is equal to zero since they are initially at rest.
Final momentum after firing = MV + mv = 0
[The negative sign indicates that the gun is recoiling]Sub Topics
- Rocket Propulsion
- Numericals
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- Solution:
- 02.
- Solution:
The motion of a rocket is an application of Newton's third law of motion and law of conservation of linear momentum.
A rocket is a projectile that carries the rocket fuel and the oxidiser, which supplies the oxygen needed for combustion. Liquid hydrogen, liquid paraffin etc., are used as rocket fuels and hydrogen peroxide, liquid oxygen etc., are used as oxidisers. The fuel-oxidiser combination in a rocket is called the propellant.
The simplest form of a rocket consists of a combustion chamber in which a solid or liquid propellant is burnt. There is a nozzle at its tail through which the gaseous products of combustion can escape. The rocket forces a jet of hot gases downwards through the nozzle. This is the action. The jet of gases exerts an equal force on the rocket, pushing it forward. This is the reaction. This force gives the rocket a forward acceleration.
Rocket Propulsion
The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle. The jet of gases acquires a momentum downwards. Hence, the rocket acquires a momentum of equal magnitude in opposite direction. Thus the rocket moves upwards.
With a single stage rocket it is not possible to attain very high speed and hence multistage rockets are designed. In multistage rockets when the fuel of the first stage gets exhausted, the rocket casing is detached and dropped off and the second stage is ignited.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoWell there is no gravity in space so as soon as a rocket is out of the hemisphere it uses the thrusters to give it a push and it won't stop until it gets in to another gravitational pull. Such as the moon if you look at a picture of how it got there and back, the path it took will look like the figure eight "8" but how does it stere? it would need thrusters on every part of the ship in order to actually steer, rockets don't steer they set a course and go straight until they get there.
Wiki User
∙ 13y agoas the rocket engine fires, hot gases are expelled out the bottom of the rocket. as the gases are sent down, they push the rocket up with an equal amount of force.
so if the engine creates 100 psi of force, it will push the gases down with 50psi and the rocket up with 50psi.
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How does a space shuttle maneuver in the exosphere?
The rocket simply relies on its little rocket thrusters to move around.
How do space crafts move in space?
Either by thrusters or a rocket engine. Thrusters work by small puffs of gass, usually CO900. Rocket engines work fuel.
How can a rocket move through space where no matter exist?
Where no matter exists, there is nothing to interfere with the rocket's motion through space. A body in motion tends to remain in motion, and if nothing interferes with that motion, the body will continue to move.
Why can a spaceship move away from Earth?
The force the rocket uses is stronger or equal to the rocket's mass, so it can push it in the opposite direction of the Earth's gravitational pull.
How can a rocket move through outer space where no matter exists for it to push on?
The conservation of momentum is such that, when a rocket throws fuel and gas out of its thrusters, in order to maintain equilibrium, the rocket moves forwards to counter the motion backwards of the propellant.
How do spacecraft move when they fire their rockets as the rockets have nothing to push against in space?
The law of conservation of momentum comes into play here. I.e A change in the momentum of the space craft ( could be direction or velocity) must cause a equal and opposite momentum change somehow. In space the rocket will carry the mass to push in the opposite direction to the required shift for the momentum change . In most space craft, fuel is burnt and products are allowed to flow backwards pushing the rocket forwards ( or changing direction). It is similar to an inflated balloon being released, the air ir pushed out in one direction and the balloon moves in the other.
What is a device that expels gas in one direction to move the opposite direction?
A balloon will do that. A rocket does that. The gas is on fire.
What is a device that expels gas in one direction to move in the opposite direction?
A balloon will do that. A rocket does that. The gas is on fire.
Why do the gases and waste products move backwards out of rockets?
Well its the only place they can move. It also helps to move the rocket upwards or wherever the rocket is going. This is the basic principle of Rocket. Rocket is propelled and move forward because of the pressure difference between the combustion chamber and the atmosphere and the coresponding raction force.. Pressure is created by burning fuel inside the chamber. Since there is only one opening in the rocket the gases move on the reverse direction of the rocket movement. ( the backward direction)
How does a space shuttle maneuver in the exosphere?
The rocket simply relies on its little rocket thrusters to move around.
What are the arrow directions for the rocket warehouse maze?
it is a electronic thing that will move you to the direction it shows...
How do space crafts move in space?
Either by thrusters or a rocket engine. Thrusters work by small puffs of gass, usually CO900. Rocket engines work fuel.
Change is to variable as move is to?
direction
How can a rocket move through space where no matter exist?
Where no matter exists, there is nothing to interfere with the rocket's motion through space. A body in motion tends to remain in motion, and if nothing interferes with that motion, the body will continue to move.
What is the ability to move and change direction quickly?
Agility is the ability to move and change direction quickly.
What is a device that expels gas in one direction to move in the opposite dirction?
That sounds like a rocket.
What makes a rocket move forward in Roblox?
The way rockets work is by modifying the velocity and body-gyro of the rocket brick. In simplified terms, after thee rocket is "created" the script detects and saves the direction the rocket is pointing.The script uses the body gyro to lock the rocket brick in the said direction and suspend the rocket in the air; then it modifies the velocity to propel the rocket forward.
