Q37 of 139 Page 41

What is meant by uniform circular motion? Give two examples of uniform circular motion.

When an object is experiencing uniform circular motion, it is traveling in a circular path at a constant speed. If r is the radius of the path, and we define the period, T, as the time it takes to make a complete circle, then the speed is given by the circumference over the period.

1. Twirling an object tied to a rope in a horizontal circle.


2. Revolution of earth


3. Hands of clock


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Write the three equations of uniformly accelerated motion. Give the meaning of each symbol which occurs in them.

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The tip of seconds’ hand of a clock takes 60 seconds to move once on the circular dial of the clock. If the radius of the dial of the clock be 10.5 cm, calculate the speed of the tip of the seconds’ hand of the clock (given p=)

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Show by means of graphical method that :

v = u + at where the symbols have their usual meanings.