(3) MOTION Class 9 th Science If a body is involved in rectilinear motion and the motion is consistent, then the acceleration of the body must be zero. Example of Uniform Motion: If the speed of a car is 10 m/s, it means that the car covers 10 meters in one second. The speed is constant in every second. Movement of blades of a ceiling fan. Non Uniform Motion: Definition: This type of motion is defined as the motion of an object in which the object travels with varied speed and it does not cover same distance in equal time intervals, irrespective of the time interval duration. Speed Speed of a body is defined as the distance travelled by the body in unit time. The SI unit of speed is metre/second (m/s Address: Mumbai, M.H. 400101, Email:
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