(1) UNIFORM MOTION : an object moving with a constant speed in a straight line is said to be in uniform motion .

(2) NON - UNIFORM MOTION ; an object moving with a varying speed in a straight line is said to be in non - uniform motion .

motion along a straight line is called rectilinear motion .

(1) DISTANCE AND DISPLACEMENT : {i} DISTANCE : total length of the path covered by an object . {ii} DISPLACEMENT : shortest distance between the inital and final positions of an object .

(2) SPEED AND VELOCITY : {i} SPEED : rate of change of distance with time (scalar quantity) . {ii} VELOCITY : rate of change of displacement with time (vector quantity) .

(3) uniform and non-uniform motion : (uniform motion ) : an object moving with a constant speed in a staright line is said to be in uniform motion (non-uniform motion ) : an object moving with a variable speed in a staright line is said to be in non-uniform motion.

(4) Acceleration : Acceleration is the rate of change of velocity .(uniform acceleration ) : constant acceleration over a period of time .(non-uniform acceleration ) : variable acceleration over a period of time .

1 . DISTANCE TIME GRAPH : shows distance vs time , with steeper slope indicating faster motion .

2. DISPLACEMENT-TIME GRAPH : shows displacement vs time , with positive slope indicating forward motion and negative slope indicating backward motion .

3. VELOCITY-TIME GRAPH : shows velocity vs time , with positive slope indicating acceleration and negative slope indicating deceleration .

4. ACCELERATION-TIME GRAPH : shows acceleration vs time , with positive slope indicating increasing acceleration and negative slope indicating decreasing acceleration .

V : final velocity . U : initial velocity . A : acceleration . T : time

(1) FIRST EQUATION OF MOTION : V = U + at

(2) SECOND EQUATION OF MOTION : S = ut + (1/2)at2

((3) THIRD EUATION OF MOTION ; v2 + u2 + 2as

INERTIA : the tendency of an object to resist changes inits state of motion or rest . MASS : the amount of matter contained in an object , which determines its inertia .

MOmentum the product of mass and velocity of an object .

FIRST LAW OF MOTION (LAW OF INERTIA ):an object at rest will remain at rest , and an object in motion will continue to move with a constant velocity , unless acted upon by an external force .

SECOND LAW OF MOTION : the force applied on an object is equal to the rate of change of its momentum .

THIRD LAW OF MOTION : for every action , there is an equal and opposite reaction .