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| Uniform Velocity and Non-uniform Velocity |
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| Imagine that two athletes Tom and Harry
are running with a uniform speed of 5 m/s on a straight line and circular
track respectively. For a layman both Tom and Harry are moving with uniform
velocity but for a physicist only Tom is running with uniform velocity
because there is no change in his speed and direction of motion. Whereas in
the case of Harry who is running along a circular track the direction of
motion is changing at every instant as circle is polygon with infinite sides
and Harry has to change his direction at every instant. |
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| Thus a body is said to be moving with uniform velocity if it covers equal distances in equal intervals of time in a specified direction. |
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| A body is said to be moving with variable velocity if it covers unequal distances in equal intervals of time and vice-versa in a specified direction or if it changes the direction of motion. |
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