Question

Q. 2
Define :
(i) Uniform Acceleration :
(ii) Variable Acceleration :
(iii) Retardation :​

Answer 1

Answer:

(i)Uniform Acceleration

An object is said to be moving with a uniform acceleration if its velocity changes by equal amounts in equal intervals of time, howsoever small the intervals may be.

(ii)Variable Acceleration

An object is said to be moving with a variable acceleration if its velocity changes by unequal amounts in equal intervals of time, howsoever small the intervals may be.

(iii) Retardation

Retardation is just the opposite of acceleration or the decrease of velocity per unit of time. Acceleration can be positeve(+),0,or negative(-). Negative of acceleration is known as retardation.

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Answer 2

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1. Uniform Acceleration

If an object's speed (velocity) is increasing at a constant rate then we say it has uniform acceleration. The rate of acceleration is constant. If a car speeds up then slows down then speeds up it doesn't have uniform acceleration.

2. Variable Acceleration

The SUVAT equations from equations of motion can only be used when an object is moving with constant acceleration. When the acceleration varies, this is when we must use calculus. Acceleration is the rate of change of velocity. To obtain acceleration from velocity you differentiate.

3. Retardation

Retardation means negative acceleration. So when the velocity of a body increase, the acceleration is said to be positive and when the velocity of a body decrease, the acceleration is said to be negative(Retardation). A body is said to be retarded if its velocity is decreasing.