Newton's third Law

(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 hose pipe tends to go backward.

Fill in the following blanks with suitable words: (a) To every action, there is an…..and….reaction (b) Momentum is a…….quantity. Its unit is…… (c ) Newton's second law of motion can be written as Force=mass xx …….or Force=………….of change of.......... (d) Forces in a Newton's third law pair have equal......but act in opposite..... (e) In collisions and explosions, the total.......remains constant, provided that no external........acts.

Statement I: Block A is moving on the horizontal surface towards right under action of force F. All surfaces are smooth. At the instant shown the force exerted by block A on block B is equal to net force on block B. Statement II: From Newton's third law, the force exerted by block A on B is equal in magnitude to force exerted by block B on A.

A piece of stone is thrown vertically upwards. It reaches the maximum height in 3 seconds. If the acceleration of the stone be 9 .8 m//s^(2) directed towards the ground, calculate the initial velocity of the stone with which it apply Newton's third law to the gravitational force? explain your answer. on the distance between them. on the surface of the earth? is thrown upwards.

A horse is urged to pull a wagon the horse refuses to try, citing Newton's third laws as a defense: the pull of the horse on the wagon is equal to but opposite the pull of the wagon on the horse. "If I can never exert a greater force on the wagon than it exerts on me, how can I ever start the wagon moving ?" Asks the horse. How would you reply ?