Chemistry, asked by sonamkumari1285, 10 months ago

(a) State Newton's third law of motion and give two examples to illustrate the law.
â(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.

Answers

Answered by shailendrachoubay216
3

Newton's third law of motion

Explanation:

a) Newton's third law :- According to Newton's law if any body exert a force on second body, second body also exert the force with same magnitude but opposite direction.

  Example:-

              1) There are gravitational force between two object in which one object is Sun while other is Earth. Where Sun produce gravitational force on earth which direction is toward Sun. By Newton's third law Earth also produce force on earth with same magnitude in direction towards earth.

              2)  If book is put on table, book produce force on table in  downward    direction. By Newton's third law table produce force on book with same magnitude but in upward direction.

b) In case of when a fireman directs a powerful stream of water on a fire from a hose pipe, the hosepipe tends to go backward.

  Reason behind above case is Newton' third law. Reason is understood by point to point given below  

  1) When water is flowing in pipe at that time there are no change in velocity of water.

 2) At time of exit of water from hose pipe, its velocity is change due to change in cross section area of hose pipe. This means water is under force which is produce by hose pipe on water in direction of flow of water.

 3) By Newton's third law

     Water also produce force on hose pipe with same magnitude but in opposite direction. Due to this force hose pipe will tend to move in backward direction.

Answered by dk6060805
2

Hose Pipe and Water React Oppositely

Explanation:

  • a.) Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.
  • Examples-
  • 1.To walk on the ground, we push the ground backward with our foot. As a reaction, the ground pushes our foot forward with the same  force. It is this forward reaction force of the ground that enables us to walk forward.
  • 2. While trying to swim, a swimmer pushes the water backward with his hands and feet. This is the force of action. The water pushes  the swimmer forward with the same force (of reaction).

  • b.) In the forward direction, there is an action of pipe upon the water which makes water rush out with higher speed and oppositely the hose pipe rushes back showing reaction for the action done.
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