Shweta(newton)

APPLICATION OF FIRST LAW OF APPLICATION OF FIRST LAW OF MOTIONMOTION

When a running horse suddenly stops, the When a running horse suddenly stops, the rider falls forward.rider falls forward.

When a horse suddenly starts moving the rider When a horse suddenly starts moving the rider falls backward.falls backward.

We hated carpet with a stick to remove the We hated carpet with a stick to remove the dustdust..

Athletes run some distance, before taking a long Athletes run some distance, before taking a long jumps .jumps .

A man jumping form a moving train may fall A man jumping form a moving train may fall down.down.

It is push or pull, It is push or pull, which either which either

changes or tends changes or tends to change the to change the

state of rest or of state of rest or of uniform motion of uniform motion of

a body.a body.

Measure of ForceMeasure of Force

A body of mass M moving with velocity v A body of mass M moving with velocity v possesses momentum .possesses momentum .

P= M vP= M vF=d /dt (Mv)=MF=d /dt (Mv)=M××dv/dt(M is constant)dv/dt(M is constant)

F=Ma (a=d v /dt)F=Ma (a=d v /dt)Force =mass Force =mass × acceleration× acceleration

INERTIAIn a absence of external

force, the inability of body change it’s state

by itself is called inertia.

Galileo's Law of Galileo's Law of InertiaInertia

In the absence of an In the absence of an external force, no external force, no

body can change on body can change on it’s own,it’s own,

it’s state of rest or it’s state of rest or the state of uniform the state of uniform motion along a state motion along a state

lineline..

MOMENTUM (Linear )MOMENTUM (Linear )

It is defined as the total quantity It is defined as the total quantity of motion contained in a body of motion contained in a body

and is measured as the product and is measured as the product of the mass of the body and it’s of the mass of the body and it’s

velocity.velocity.

(momentum)(momentum) P=M v P=M vM=mass of the bodyM=mass of the body

v=velocityv=velocity

APPLICATION OF SECOND APPLICATION OF SECOND LAW OF MOTIONLAW OF MOTION..

When catching a ball a cricket player When catching a ball a cricket player lowers his hands to save himself from lowers his hands to save himself from getting hurt.getting hurt.

Cars, busses, trucks, bogies of the Cars, busses, trucks, bogies of the train, etc. are provided with a spring train, etc. are provided with a spring system to avoid server jerks.system to avoid server jerks.

Bogies of the train are provided with Bogies of the train are provided with buffer to avoid server jerks during buffer to avoid server jerks during shunting of trains.shunting of trains.

A person falling on frozen ice is likely to A person falling on frozen ice is likely to receive more injuries than one falling receive more injuries than one falling on kuchcha floor.on kuchcha floor.

China wares are wrapped in straw or China wares are wrapped in straw or paper before packing.paper before packing.

IMPULSEIMPULSEThe forces which act on bodies for The forces which act on bodies for

short time are called impulsive short time are called impulsive force.force.

For Ex:-For Ex:-1.In hitting a ball with a bat.1.In hitting a ball with a bat.

2.In firing a gun ,etc2.In firing a gun ,etcImpulse of a force is a measure of Impulse of a force is a measure of

total effect of the force .total effect of the force .

APPLICATION OF THIRD LAW OF MOTION

While firing a bullet , the gun must be held tight to the shoulder.

When a man jumps from a boat to the shore, the boat slightly moves away from the shore.

When a bullet is fired from a gun, the gun recalls or gives a kick in backward direction.

Rocket works on the principle of conservation of momentum.

If some one left on a frictionless floor desire to get out of it, he can do so by blowing air out of his mouth.