mohit gujjar

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IX A PHYSICS:

IX A PHYSICS PREETI,NIDHI,SUNNY,PRITI PGT PHYSICS K.V. SIKH LINE Cp – 8 Motion

State of Object:

State of Object There are two states of an object Rest State Motion State

Rest State:

Rest State If the position of an object is not change with time , then that object is known in rest state.

Motion State:

Motion State If the position of an object changes with time, them that object is known as motion state. Motion means movement.

Types of motion:

Types of motion There are many types of motion- Translational motion Rotational motion Vibration motion

Scalar Quantities:

Scalar Quantities The physical quantities which requires only magnitude to describe them and there is no need to direction are known as Scalar Quantities. Example:- Distance ,speed ,time , volume , area, density, work, energy , power , temperature , Pressure etc.

Vector Quantities:

Vector Quantities The physical quantities which requires direction as well as magnitude to describe them are known as Vector Quantities. Example:- Displacement , Velocity , Acceleration , Force , Momentum etc.

Distance:

Distance The length of actual path travelled by an object is known as Distance covered by the object. It is a scalar quantity.

Displacement:

Displacement The shortest distance travelled between initial point to final point of path travelled of an object is known as Displacement of that object. It is a Vector quantity.

Difference between Distance & Displacement:

Difference between Distance & Displacement S.No . Distance Displacement 1 It is length of actual path travelled by object. It is shortest distance travelled by object between initial and final point of path. 2 It is scalar quantity It is vector quantity 3 It never be zero. It can be zero.

Question What is the distance and displacement travelled in one complete cycle in circular motion:

Question What is the distance and displacement travelled in one complete cycle in circular motion Answer- Distance = 2 π r Distance = 0

Speed:

Speed The rate of change of distance of a moving object is known as its speed Speed = distance/time. It is a scalar quantity

Velocity:

Velocity The rate of change of displacement of an moving object is known as its velocity. It is a vector quantity. Velocity = Displacement/Time It’s unit is m/sec.

Difference between Speed & Velocity:

Difference between Speed & Velocity S.No . Speed Velocity 1 It is the rate of change of distance of moving object. It is the rate of change of displacement of moving object. 2 It is scalar quantity It is vector quantity 3 It never be zero. It can be zero.

Uniform motion:

Uniform motion A kind of motion in which an object travels equal distances in equal time intervals is known is uniform motion. A motion in which speed of moving object is constant is also known as uniform motion.

Acceleration:

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/sec 2 .

Retardation:

Retardation The rate of decreasing of velocity of a moving object is known as retardation. It is also a vector quantity.

Uniform Accelerated motion:

Uniform Accelerated motion A kind of motion in which velocity of an object increases in equal amount in equal time intervals is known is uniform accelerated motion. A motion in which acceleration of moving object is constant is also known as uniform accelerated motion.

Distance – time Graph:

Distance – time Graph A graph , which shows the distance travelled by an object with time is known as Distance time graph. The slope of distance-time graph represent the speed of the object.

Distance time Graph for object in rest:

Distance time Graph for object in rest

Distance time Graph for uniform motion:

Distance time Graph for uniform motion

Distance-time graph for non uniform motion:

Distance-time graph for non uniform motion

Velocity – time Graph:

Velocity – time Graph A graph , which shows the change in velocity of an object with time is known as Velocity time graph. The area under the velocity-time graph and time axis represent the displacement of the object. It’s slope represent the acceleration .

Velocity time graph for uniform motion:

Velocity time graph for uniform motion

Velocity time graph for uniform accelerated motion:

Velocity time graph for uniform accelerated motion

Newton Equation of Motion:

Newton Equation of Motion V = u + at s =  ut + ½ at 2   v 2 = u 2 + 2as 

Uniform circular motion:

Uniform circular motion If an object moves in a circular path with uniform speed, then its motion is known as uniform circular motion

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