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| Velocity |
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| Figure below gives different routes that
Jack can choose from his house to school. |
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Jack goes regularly to school by car, with an average speed of 60 km/hr. Is it possible to find out the time required to reach the destination? Yes, you can definitely find out the time using the relation,  but
you are not sure of the route which he would have taken. Thus, by just giving the speed of a moving object it is not possible to locate the exact position of the object at a given time. Thus, there arises a need to define a quantity, which has both magnitude and direction. |
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| Consider two objects P and Q starting from A. Let them cover equal distances in equal intervals of time i.e., their speeds are the same. Can you tell where each of them would be after say 20 seconds? P and Q can move in any direction. To locate the exact position of P and Q we require their direction of motion also. |
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| Thus another physical quantity called velocity is introduced to give us the idea of speed as well as direction. |
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| Velocity is defined as the distance covered by a moving object in a particular direction in unit time or speed in a particular direction. |
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SI unit of velocity is m/s (meter/second). [ SI unit of distance is
meter and that of time is second] |
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| Velocity is a vector quantity. |
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