User:Prakhar 94

ACCELERATION Rate of change of velocity. Acceleration like velocity is a vector quantity:it has both magnitude and direction. The velocity of an object moving on a straight can change in magnitude only, so its acceleration is the rate of change of its speed. On a curved path, the velocity may or may not change in magnitude but it will always change in direction, which means that the acceleration of an object moving on a curved path can never be zero. If velocity is stated in metres per second(m/s) and the time intervals in seconds(s), then the units of acceleration are metres per second per second(m/s/s or m/s2) CENTRIPETAL ACCELERATION Property of the motion of an object travelling in a circular path. Centripetal describes the force on the object, directed toward the centre of the circle, which causes a constant change in the object's direction and thus its acceleration. The magnitude of centripetal acceleration a is equal to the square of the object's velocity v along the curved path divided by the object's distance r from the centre of the circle, or a=v2 /r