Question

Define the following: (i) Speed (ii) Uniform Velocity (iii) Non-uniform velocity (iv) Uniform acceleration

ICSE Class 9 Physics Chapter Motion in One Dimension

Answer 1

(i)Speed-Speed of a boy is the distance travelled by the body per unit time.
(i) Uniform velocity: The body has a uniform velocity if it travels in a straight line and moves over equal distances in equal time intervals, no matter how small these time intervals may be.
(iii) Non-uniform velocity: A body has a non-uniform velocity or variable velocity if it travels unequal distances in equal time intervals in a specified direction or equal distances in equal time intervals but in different directions.
(iv) Average velocity: It is the average distance travelled by a moving body per unit time in specified direction when the body is moving with variable velocity.