Question

What are the 3 applications of Newton's third law of motion? ​

Answer 1

Newton's third law of motion :-

For every action, there is an equal and opposite reaction

Applications of Newton's third law of motion :-

1. The rocket fuel is ejected out from the back of the rocket with equal forward force of the rocket due to a strong backward force.

2. We push our feet down and with the same gravitational force the earth pushes back to our feet to keep us standing.

3. While swimming when our hands and feet push against the water and it  pushes back the same force to the swimmer and pushes the swimmer forward.

Answer 2

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Applications of Newton's third law of motion are as given below :-

=> Collision of two persons - If two persons walking or running in opposite directions collide with each other , then both feel hurt because they apply force to each other . Two opposing forces are in action and reaction pair .

=>Walking of a person - A person is able to walk because the Newton's third law of motion. During walking , a person pushes the ground in backward direction and in the reaction , the ground also pushes the person with equal magnitude of force but in opposite directions . This enables him to move in forward direction against the push .

=> Recoil of gun - When bullet is fired from a gun , then the bullet also pushes the gun in opposite directions with equal magnitude of force . Since , the gun has a greater mass than bullet , Acceleration of the gun is much less than the Acceleration of bullet .

=> Propulsion of a boat in forward direction - Sailor pushes water with oar in forward direction . Consequently , the boat is pushed in forward direction . Force applied by oar and water are of equal magnitude but in opposite directions.

=> Rocket propulsion - The propulsion of rocket is based on the principle of action and reaction. The rapid burning of fuel produces hot gases which rush out from the nozzle at the rear end at very high speed . The equal and opposite reaction force moves the rocket upward at a great speed .