Q19 of 25 Page 130

Obtain information about commonly used gadgets or devices which are based on the principles of Newton' laws of motion.

First Law of Motion

Every object which is at rest or uniform motion continues to be in rest or uniform motion unless compelled to change its state by the action of net force.


Example: A space craft in space


Second Law of Motion


The rate of change of momentum of a body is directly proportional to the force acting on it.


Example: Air bags, shaking of tree and fruits fall, the fielder in match pulls his hand backwards to reduce impact.


Third Law of Motion


For every action, there is an equal and opposite reaction.


Example: Principle of rocket, recoil of gun.


More from this chapter

All 25 →
17

A boatman pushes the river bank with a bamboo pole to take his boat into the river. Explain with reference to Newton's Third Law of Motion.

 18

An object is dropped from rest at the height of 150 m, and another object is dropped from rest at a height of100 m. What is the difference in their height after 2 sec if both the object drop with the same acceleration? How does the difference in heights vary with time?

 20

Derive equation for position - velocity relation graphically.

 21

State Newton's Second Law of motion. Derive a mathematical expression for Newton's second law.