• We see the moving vehicles • Walking people • Running trains • If I ask you how fast or slow these objects are moving, can you tell me? • Cars are fast (CU kids telling) • Walking is slow (CU kids telling) • Train is very fast (CU kids telling) • But if we want to measure accurately how fast and slow these machines are we’ve to know their speed. • Speed is “the distance traveled in unit time” • Its symbol is v • Formula of speed is measured by dividing total distance covered in unit time. • Mathematically its is represented as v is equal to d over t • Here v is representing speed, d is used for distance and t is used for time. • Unit of speed is meter per second. • Speed is a scalar quantity. • Let’s take an example • Suppose here’s a stop-watch and here’s a bi-cycle on clean road. • It moves from this tree to that house. • Look it covered 200 meters in 5 sec. • So its speed is 40m/sec.
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