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· Motion is a change of position, which can be described in terms of the distance moved or the displacement.
· The motion of an object could be uniform or non-uniform depending on its velocity.
· The speed of an object is the distance covered per unit time and velocity is the displacement per unit time.
· The acceleration of an object is the change in velocity per unit time.
· Uniform and non-uniform motion of object can be shown through graphs.
The motion of an object at uniform acceleration can be described with the help of three equations, namely
v = u + at
s = ut + ½ a t2
v2= u2 + 2as
where u is initial velocity of the object, v is its final velocity, s is the distance travelled in time t, a is the acceleration.
For a freely falling body the acceleration a is replaced by g.
An object under uniform circular motion experiences centripetal force.
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