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(a) State Newton's third law of motion and give two examples to illustrate the law. (b) Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hosepipe tends to go backward.
a. Newtons third law states that for every action, there is an equal; and opposite reaction. This means that if a body exerts a force on another body, then another body also exerts a force of the same magnitude and opposite direction.
Below are two examples for illustrating Newton's third law of Motion:
1. Jet plane's mechanism is based on Newton's third law of motion. Jet plane exhausts the gas downwards with a force and in reaction, the gas also pushes the Jet Plane in the upward direction.
2. A book placed over a table exerts a force on the table downwards and in reaction, the table also pushes the book with the same force in an upward direction.
b). When a fireman directs a powerful stream of water on a fire from a hosepipe, the hosepipe tends to go backward, it can be understood by Newton's third law of motion. When the water exits from the hosepipe with a large pressure, in reaction the water also exerts the same force on the hosepipe. That's why the hosepipe tends to go backward.
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