# KINEMATICS CRASH COURSE FOR JEE MAIN / NEET / WBJEE / CBSE / CLASS 11TH IN PDF

PHYSICS CRASH COURSE FOR JEE,NEET,IIT JEE,CBSE,WBJEE

CHAPTER 2

KINEMATICS

Frame of Reference

A frame of reference refers to a coordinate system or set of axis within which to measure the position, orientation and other properties of objects in it or it may refer to an observational reference frame tied to the state of motion of an observer .

MOTION IN STRAIGHT LINE

When particle or object moves in a straight line or a single plane .In this motion if we represent the motion of particle in coordinate , then the particle moves in positive or negative direction respect to the origin , along x -axis or y – axis .

DISPLACEMENT

This term is so important to using in various chapter of physics . The displacement

∆x

of a particle is the change in its position in a particular direction .

∆x=x2-x1 Where  x2=final position of the particle               x1= intitial position of particle                 respect to the reference frame

Displacement has  both of magnitude and direction , positive and negative .Such quantities are represent by vector .

The magnitude of displacement may or may not be equal to the path of length traveled by the particle.      NOTE : When a particle moves in single direction , then the displacement be the same with the length of path of particle . Displacement may positive or negative that depends on your reference frame.

Like , Displacement is positive  , if the particle has moved in the positive  direction of the x-axis and negative if the particle has moved in the negative direction .

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