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# CBSE Class 11th Physics Notes for Chapter 3 Motion In A Straight Line

Chapter 3 Motion In A Straight Line

Motion along a straight line is also called rectilinear motion.

Average velocity: Average velocity is defined as the change in the position or displacement divided the time intervals in which the displacement occurs.

Average speed: Average speed is defined as the total path length travelled divided by the total time interval during which the motion has taken place.

Instantaneous velocity: The velocity at an instant is known as instantaneous velocity and is defined by the limit of the average velocity as the time interval ∆t becomes infinitesimally small.

Acceleration: The average acceleration over a time interval is defined as the change of velocity divided by the time interval.

KINEMATIC EQUATIONS FOR UNIFORMLY ACCELERATED MOTION

1. v = v0 + at
2. x = v0t + at2
3. v2 = v02 + 2ax