Motion under Gravity

MOTION UNDER GRAVITY

When a body drop from a certain height, it moves towards the ground and its velocity increases continuously till it strike the ground and then body get some acceleration which is called acceleration due to gravity and it is define as follow

                “The acceleration produces in a free falling body due to force of gravity is called acceleration due to gravity”.

Acceleration due to gravity is denoted by ‘g’   and its value is 9.8 m/s².

EQUATIONS OF MOTION DURING MOTION UNDER GRAVITY

Second Equation of Motion

 Second Equation of Motion

Third equation of motion

Third equation of motion

First Equation of Motion, Derivation

 First Equation of Motion, Derivation

Difference b/w velocity and acceleration

DIFFERENTIATE B/W VELOCITY AND ACCELERATION

VELOCITY	ACCELERATION
v  Velocity of the body is the rate of change of displacement. v  Its unit is ms-1. v  It is zero when the body at rest.	v  Acceleration of a body is the rate of change of velocity. v  Its unit is ms-2. v  It is zero for an object at rest or on uniform motion.

Acceleration and it's Types

 Acceleration and it's Types

DIFFERENTIATE B/W SPEED AND VELOCITY

 DIFFERENTIATE B/W SPEED AND VELOCITY

SPEED	VELOCITY
v  Speed of the body is the rate of change of distance. v  Speed does not tell us anything about the direction of its motion. v  It is scalar quantity. v  It’s unit is ms-1.	v  Velocity of the body is the rate of change of displacement. v  Velocity of the body tell us the direction on which the body is moving. v  It is vector quantity. v  It’s unit is ms-1.

Velocity and it's types, average velocity, uniform velocity, non uniform and average velocity,

 Velocity and it's types.

Distance, Displacement, Differentiate between Distance and Displacement

 Distance

The total length covered by the body between two points in any direction is called distance.

ü  It is scalar quantity.

ü  Its unit is meter.

DISPLACEMENT

The change of position of a body in a particular direction is called is displacement.

OR

The shortest distance b/w two points in a straight line is called displacement.

ü  It is vector quantity.

ü  Its unit is meter.

DISTANCE	DISPLACEMENT
v  The space b/w two positions without a reference of direction is called distance (s). v  It has magnitude only. v  It is scalar quantity. v  It is denoted by ‘S’ v  It’s S.I unit is meter (m).	v  Displacement refers to distance moved in a specified direction. v  It has magnitude as well as direction. v  It is a vector quantity v  It is denoted by ‘ ’, ‘ ’. v  It’s S.I unit is meter (m).

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TYPES OF MOTION, LINAER MOTION, ROTATORY MOTION, VIBRATORY MOTION

 TYPES OF MOTION

                There are three types of motion.

ü  LINEAR MOTION

If a body moving in straight line,or curved line then its motion is called linear motion.

·         Motion of car on a rod.

·         Motion of train on its track.

 

ü ROTATORY MOTION

If a body moves in a circle or rotates about a fixed point or axis, then its motion is called rotatory motion.

·         Motion of wheels of moving car.

·         Motion of blades of a moving electric fan.

 

ü VIBRATORY  MOTION

To and Fro motion of a body about mean position, executed at a regular intervals of time is called vibratory of oscillatory motion.

·         Motion of simple pendulum.

·         Motion of stretched spring.

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KINEMATICS, REST AND MOTION

 

KINEMATICS

                The branch of physics which deal with description of motion of object without reference to the force or agent causing motion is called Kinematics.

REST

If a body does not change its position with respect to its surrounding than it is said to be in a

state of rest.  e.g.

·         A book lying on the table.

·         A bus standing on the bus stop.

MOTION

If a body changes its position with respect to its surrounding than it is said to be in a state of motion.  e.g.

·         Motion of car on the road.

·         Someone move from one place to another.

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