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Author Topic: Thrusters work in space! How?  (Read 162 times)

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Offline jigarmech

Thrusters work in space! How?
« on: December 27, 2017, 03:42:55 PM »
I am looking forward for an explanation of thrusters working in space. As i believe, as per newton's 3rd law, every action has equal and opposite reaction. As there's nothing behind the thrusters(space is nothing, zero G and Vacuum) to have opposite reaction to push the space craft move ahead. So how it works?
Little bit confused.
"A neutron walks into a bar and asks how much for a drink, the barman replies for you NO CHARGE"

Offline susovan

Re: Thrusters work in space! How?
« Reply #1 on: December 27, 2017, 04:19:27 PM »
One name for a thruster is a reaction motor. Put very simply, a reaction motor pushes mass in one direction at high speed. The motor (and whatever it’s bolted to) moves in the opposite direction because of the counteracting reaction. The thruster, doesn’t have to push against anything. The thrust accelerates the rocket as described by Newton's second law of motion. (SECOND LAW - The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object).

You get this effect when you fire a gun, such as a cannon. When you fire a cannon, it recoils—it moves backward. This is the offsetting reaction to the cannonball flying out the muzzle. Before you fired the cannon, nothing was moving. After you fire the cannon, the moving cannonball and the moving cannon cancel each other out.

Air has nothing to do with this. It’s all a question of balancing momentum.   THIS was also a  :021:

Offline jigarmech

Re: Thrusters work in space! How?
« Reply #2 on: December 27, 2017, 04:23:53 PM »
 :sign0098:
thanks and understood! :c017:
"A neutron walks into a bar and asks how much for a drink, the barman replies for you NO CHARGE"

Offline nethan

Re: Thrusters work in space! How?
« Reply #3 on: December 28, 2017, 10:16:52 PM »
One name for a thruster is a reaction motor. Put very simply, a reaction motor pushes mass in one direction at high speed. The motor (and whatever it’s bolted to) moves in the opposite direction because of the counteracting reaction. The thruster, doesn’t have to push against anything. The thrust accelerates the rocket as described by Newton's second law of motion. (SECOND LAW - The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object).

You get this effect when you fire a gun, such as a cannon. When you fire a cannon, it recoils—it moves backward. This is the offsetting reaction to the cannonball flying out the muzzle. Before you fired the cannon, nothing was moving. After you fire the cannon, the moving cannonball and the moving cannon cancel each other out.

Air has nothing to do with this. It’s all a question of balancing momentum.   THIS was also a  :021:
:bravo_2:
“The greatest challenge in life is discovering who you are, The second greatest is being happy with what you find.”
― Auliq Ice

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