Question

1. Distinguish between uniform motion and non, uniform motion. Is uniformly accelerated motion uniform motion? Give one example each of uniform and
motion.
2. The speedometer readings of a car are shown below. Find the acceleration of the car
and its displacement.
Time Speedometer:- 9:25 am - 36 km/h
9:45 am - 72 km/h.
3. A car travels at 54 km/h for first 20 s, 36 km/h for next 30 s and finally 18 km/h for
next 10 s. Find its average speed.
4. Define acceleration and give its SI unit. When is the acceleration of a body negative?
Give two examples of situations in which the acceleration of the body is negative.

5. Define uniform circular motion and give an example of it. Why is it called accelerated
motion?

Answer 1

Answer:

(4)Acceleration can be defined as the rate of change of velocity.. It is a vector quantity .. Its SI unit is meter/second^2. ... An example of negative acceleration would be a car breaking or decelerating.

(5)When an object moves in a circular path with uniform speed, its motion is called uniform circular motion,examples: movement of blades of a fan in constant speed, revolution of Earth etc.. As the direction of velocity is changing continuously in uniform accelerated motion, that's why it is called accelerated motion.