Question

Laws of motion and equation of motion of class 9
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Answer 1

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"Newton's laws of motion"

* Established by Sir Isaac Newton in 1686.

* Gives relationship between force applied and state of motion acquired by it.
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First law of motion.

A body continues its state of rest or of uniform motion in a straight line unless an external force acts on it.

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Second law of motion.


The rate of change of momentum of a body is directly proportional to force applied and change in momentum is along the direction of applied force.
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Third law of motion.


To every action there is an equal and opposite reaction; but the action and reaction forces act on different bodies.
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Answer 2

1st law of motion-Every object in a state of uniform motion tends to be in that state of motion unless an external unbalanced force is applied to it.

2nd law of motion-The rate of change of momentum is proportional to the unbalanced force in the direction of force.

3rd law of motion-To every action there is an equal and opposite reaction.

Equations of motion-

1. a=(v-u)/t

2. 2as=(v square) - (u square)

3. s=ut+(1/2)at square

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