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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
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