Velocity and Acceleration

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 Velocity (v): Speed of an object in a particular direction is named as velocity, i.e., it is the displacement of body in unit time. It is a vector quantity.

 Average velocity: It is given by the arithmetic mean of initial velocity and final velocity for a given period of time.

Acceleration (a): The rate of change of velocity is termed as acceleration. Its SI unit is metre/seccond2 (m/s2). It is a vector quantity. The acceleration is taken to be positive if it is in the direction of velocity and negative when it is opposite to the direction of velocity.

 Negative acceleration is also named as retardation or deceleration. An object moving on a circular path though with uniform speed, is always said to be accelerated as it changes its direction every moment.

 Uniform acceleration: When velocity of body changes by equal amounts in equal time intervals, acceleration is said to be uniform. For example: Motion of a freely falling ball. Non - uniform acceleration: When velocity of body changes by unequal amounts in equal intervals if time, acceleration is said to be non - uniform. For example: Motion of car. 


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