Question

Different types of examples are given below .
identify the motion which shows acceleration and give reason for your answer
a. a boy is riding a bicycle on a straight road with same speed
B, a car is moving on a road in heavy traffic

Answer 1

Answer:

(B) A car moving on a road in heavy traffic shows acceleration motion

Explanation:

• Acceleration:Change in the speed of an object with time is acceleration

Lets look into both the examples:

Example 1: A boy is riding his cycle with same speed hence there is no change in velocity which means acceleration=0. (friction not taken into account)

Example 2: A car moving in heavy traffic will show a change in velocity as, sometimes it has to stop, reduce the velocity and sometimes increase.Hence a change in velocity will always lead to acceleration.

Answer 2

(a) There is no acceleration. This is because the velocity is constant and there is no change in it. If the boy rides his bicycle in a circular path, there must be acceleration in the boy.

Mathematically,

a = ∆v/∆t = (v - u)/t = (v - v)/t = 0/t = 0.

(b) Yes, there is a continuous acceleration and deceleration. Since the speed and direction is changing, there must be acceleration.