Question

When a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward. This is an example of Newton’s:
A) Law of gravitation
B) First law of motion
C) Second law of motion
D) Third law of motion

Answer 1

Hint: According to Newton's law of motion, for every action there is an equal and opposite reaction.
The laws of motion discovered by Newton are used everywhere in our daily life. Among them the third law is applied for many purposes.

Complete step by step answer:
There are mainly three laws of motion and they are;
First one states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This property is commonly called as inertia
The second law states that a force will be equal to the change in momentum per change in time. It can also be said as like the impact created by an object depends upon its mass and velocity
The third law states that every action has an equal and opposite reaction. This is the simplest stated but is used in a wide variety of everyday actions. The situation explained in this question can be explained using this law. When a fireman directs the jet of water strongly on a fire, he holds it strongly because the hose has the tendency to go backward. This is because of the fact that when water moves at a high speed through the hose in the forward direction, it exerts an equal reaction or pressure in the backward direction also. This is a simple example for Newton's third law of motion.

So, the correct answer is Option D.

Additional Information:
Isaac Newton is a person in the discovery of many valuable theories of science. He discovered those complex theories at a time when the technology was not at all developed this much.

Note: Third law of motion finds application in many processes. It is the reason why a gun moves backward when we fire it. In our daily life some processes like walking and swimming are applicable to Newton's third law of motion.