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It is a full explantion of chapter motion of class 9th
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MOTION AND REST MOTION AN OBJECT IS SAID TO BE AT MOTION IF THE POSITION OF THE OBJECT IS CHANGING WITH RESPECT TO THE STATIONARY OBJECT , THE IT IS CALLED AS MOTION REST AN OBJECT IS SAID TO BE AT REST IF THE POSITION OF THE OBJECT NOT CHANGING WITH RESPECT TO THE STATIONRY OBJECT IS SAID TO BE AT REST
DISTANCE AND DISPLACMENT DISPLACEMENT SHORTEST DISTANCE COVERD BY AN OBJECT IS CALLED AS DISPLACEMENT STANDARD UNIT OF DISPLACEMENT IS METER DISTANCE CAN BE ZERO , NEGETIVE OR POSITIVE DISPLACEMENT IS VECTOR QUANTITY DISTANCE ACTUAL LENGTH COVERED BY AN OBJECT IS CALLED AS DISTANCE STANDARD UNIT OF DISTANCE IS METER DISTANCE CANNOT BE NEGETIVE DISTANCE IS SCALAR QUANTITY
SPEED AND VELOCITY VELOCITY DISPLACEMENT PER UNIT OF TIME BY A BODY VELOCITY IS VECTOR QUANTITY VELOCITY CAN BE ZERO, POSITIVE OR NEGETIVE STANDAT UNIT OF VELOCITY IS M/S VELOCITY = DISPLACEMENT TIME TAKEN AVEREGE VELOCITY =DISPLACEMENT TIME TAKEN SPEED DISTANCE TRAVELLED PER UNIT TIME BT A BODY SPPED IS A SCALAR QUANTITY SPPED IS ALWAYS POSITIVE STANDARD UNIT OF SPPED IS m/s SPPED=DISTANCE TRAVELLED TIME TAKEN AVERAGE SPEED= DISTANCETRAVELLED TIME TAKEN
UNIFORMANDNON- UNIFORM ACCELARATION • EQUAL CHANGE IN VELOCITY IN EQUAL INTERVAL OF TIME IS CALLED AS UNIFORM ACCELARATION • UNEQUAL CHANGE OF VELOCITY IN EQUAL INTERVAL OF TIME IS CALLED AS NON – UNIFORM ACCELARATION
ACCELARATION THE RATE OF CHANGE OF VELOCITY IS CALLED AS ACCELARATION ACCELARATION=CHANGE IN VELOCITY TIME TAKEN CHANGE IN VELOCITY = FINAL VELOCITY – INTIAL VELOCITY TIME TAKEN
Velocity - timegraph If the graph is drawn by taking time on x-axix and speed or velocity on y axis , then the graph is know as speed-time graph or velocity – time graph
FROM SINCHANA K.Y 9th A TO: JNV MANDYA PHYSICS TEACHER