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# Motion

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• 1. Some objects in our surrounding are moving with respect to the stationary ones. Based on that object or body in our surroundings, our environment can be classified as :- • Stationary Objects ( in rest ) • Moving Objects ( in motion ) CONCEPT :-
• 2. A body is said to be in motion when it’s position changes continuously with respect to reference point (stationary object). • E.g.:- hand of the clock are in motion. Reference point :- • When a car moves in front of a forest • With respect to the trees car is moving. • Trees – reference point MOTION
• 3. Scalar : • Gives only magnitude Vector : • Give both magnitude and direction Vector and Scalar e.g. Scalar Vector
• 4. A body travels in uniform motion when it travels equal distance in equal interval of time. A body travels in Non uniform motion when it travels unequal distance in equal interval of time. Uniform and Non Uniform motion UniformNon Uniform
• 5. Speed:- distance travelled by a body per unit time ………. speed = distance/time Speed is scalar Speedometer and Odometer are used to measure speed of an object Speed
• 6. Average speed :- The average speed of a body is the total distance travelled by the total time taken. Average Speed = Total distance traveled / Total time taken Average and Uniform Speed
• 7. Velocity :- distance travelled by a body per unit time in a given direction…… VELOCITY = displacement / time Velocity is vector. Direction of a body is as displacement at the body. Velocity
• 8. Uniform Velocity
• 9. Average Velocity
• 10. Acceleration •The rate of change of velocity of an moving object is known as its Acceleration. •It is a vector quantity. •Acceleration = Velocity/Time •It’s unit is m/sec2.
• 11. Retardation
• 12. - Prateek Saxena 9th B 14