Question

Explain : Acceleration , Uniform acceleration , Non uniform acceleration and retardation

Answer 1

The rate of change of velocity of the body with time is called acceleration

the body moving along a straight line changes by equal amounts in equal intervals of time and velocity of a body changes at a uniform rate is said to be uniform acceleration

when velocity of a body changes by unequal amounts in equal intervals of time is known as non uniform acceleration

negative acceleration is called retardation

Answer 2

Acceleration is a Physical Unit. Acceleration can be defied as follows:-

1) Acceleration is first derivative of velocity with respect to time.

If the acceleration of a body is a and velocity is v at any time t

Then,

a=\frac{dv}{dt}a=

dt

dv

2) Acceleration is second derivative of displacement with respect to time.

If the acceleration of a body is a and displacement is 's' at any time t,

Then,

a=\frac{d^2s}{dt^2}a=

dt

2

d

2

s

3) In Other words, Acceleration is change in velocity with time

a=\frac{v}{t}a=

t

v

SI unit of acceleration is m/s². It is generally denoted by 'a'