Question 35:
Define motion. What do you understand by the terms ‘uniform motion’ and ‘non-uniform motion’ ? Explain with examples.
(a) Define speed. What is the SI unit of speed ?
(b) What is meant by (i) average speed, and (ii) uniform speed ?
Lakhmir Singh Physics Class 9
Answers
Explanation:
An object is said to be in motion if it change its position with respect to surrounding with the passage of time
Example : A train moving on rails.
UNIFORM MOTION
An object said to be uniform motion if it cover equal distance in equal interval of time , however small time interview may be , in the same fixed direction.
Example :
A train cover 1200 m in 1 minute in a given direction ,it indicate that it cover 600 m in every 30 second , 300 m in every 15 second , and 100 m in every 5 second and so on
NON UNIFORM MOTION:
A body said to be non uniform motion its velocity change with time .
Example:
A velocity of vehicle is different at different instant and so it has non uniform motion.
SPEED AND ITS SI UNIT :
The rate of change of position of an object with time in any direction is called speed.
SI unit is. ( Meter / Second ).
Thank you