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Q.

Which of the following principles does rocket work?


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a

Newton’s first law of motion

b

Newton’s second law of motion

c

Universal law of gravitation

d

Law of conservation of momentum 

answer is D.

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Detailed Solution

Rockets work on the law of conservation of momentum.
A rocket is a device that propels itself forward by expelling particles of a fuel mixture downward.
The principle of momentum conservation underpins rocket propulsion. When the rocket is initiated, the exhaust gases rush downward at rapid speed, providing the rocket with the opposite momentum and pushing it upward.
Thus, the reaction forces of high-speed gases ejected at the back of the rocket provide thrust. As a result, the rocket's impulse is caused by a rapid change in momentum.
 
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