Model Paper 4 — Science STD 9 — Question

a. Jet airplanes and rockets work on the principle of Newton's third law of motion. In this case, the hot gases come out of a nozzle (a fine opening) with a great force, i.e., action and the rocket moves with high speed upwards as a reaction.
b. If we fill a balloon with air and hold it with its mouth downwards, then when we release the balloon, the air rushes out vertically downwards (action). *The balloon moves vertically upwards (reaction).

c. When a gun is fired, the bullet goes out (action) due to the force applied on it. According to Newton's third law of motion, the gun recoils backward due to the reaction acting on it in the opposite direction.