NAVODAYA VIDYALAYA SAMITI, NOIDA

E-CONTENT PREPARATION

FOR CLASS 9^TH SCIENCE

CHAPTER-9: FORCE AND LAWS OF MOTION

BY

SREENIVASAN T.A, PGT PHYSICS

JNV, MALAPPURAM, KERALA

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HOW MOTION BEGINS

HOW MOTION STOPS

NEWTON’S FIRST LAW OF MOTION

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EVERY BODY CONTINUES IN ITS STATE OF REST OR

OF UNIFORM MOTION ALONG A STRAIGHT LINE UNLESS COMPELLED BY AN EXTERNAL UNBALANCED FORCE

FORCE

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Force is defined as that external agent which changes or tend to change the state of Inertia

Examples : Push Pull, Kick,Catch lift etc

Fffor every action there is an equal and opposite reaction

Law of Conservation of momentum

• The law of conservation of momentum states that if no external force is acting on a system, the total linear momentum will remain constant.
• Momentum before collision =momentum after collision

ROCKET PROPULSION

THANKS