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MOTION ANDRESTMade by sarthak kumar

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MOTION

A body is said to be in motion when its position

changes continuously with respect to a stationaryobject taken as reference point.

Motion depends on distance and displacement.

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Distance

The distance travelled by a body is the actuallength of the path covered by a moving bodyirrespective of the direction in which the bodytravels.

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Displacement

When a body moves from one position toanother , the shortest distance between the initialposition and nal position of the body, along withdirection , is known as its displacement.

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Uniform motion

A body has a uniform motion if it travels eualdistance in eual interval of time , no matter howsmall these time intervals may be.

The distance time graph for uniform motion is astraight line.

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Non uniform motion

A body has a non!uniform if it travels uneual

distance in eual interval of time. The distance time graph for a body having non!

uniform motion is a curved line.

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Speed

The speed is an idea of how slow or fast that bodyis moving.

"peed of a body is the distance travelled by it perunit time.

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Average speed

The average speed of a body is the total distance

travelled divided by the total time taken to coverthis distance.

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Uniform speed

A body has uniform speed if it travels eualdistance in eual intervals of time , no matter howsmall these time intervals may be.

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Velocit

#elocity of the body is the distance travel by it perunit time in a given direction.

#elocity of the body is the displacement producedper unit time.

The "$ unit of the velocity is same as speed %m&sor ms!'(

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Uniform velocit

A body has a uniform velocity if it travels in a

specied direction in a straight line and movesover eual distance in eual interval of time , nomatter how small these time intervals may be.

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Acceleration

Acceleration of a body is dened as the rate ofchange of its velocity with time.

The "$ unit of acceleration is meter per secondsuare.

Acceleration is a vector uantity.

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Uniform acceleration

A body has a uniform acceleration if it travels in a

straight line and its velocity increases by eualamounts in eual interval of time.

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Non!uniform acceeration

A body has a non uniform acceleration if its

velocity increases by uneual amounts in eualinterval of time.

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Retardation

A body is said to be in retardation when itsvelocity decreases.

$f the velocity increases , acceleration take placeand when the velocity decreases , retardation takeplace.

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E"uation of uniformlaccelerated motion

)irst euation * v*u+at

"econd euation * s*ut +'& at

Third euation * v *u+as

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Uniform circular motion

When a body moves along a circular path ,then itsdirection of motion keeps changing continuously.

When a body moves in a circular path withuniform speed , its motion is called uniformcircular motion.

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T#AN$ %OU)rom sarthak kumar