1.

a) What is meant by uniform circular motion? Give two examples of uniform circular motion.b) The tip of second’s 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 10.5cm, calculate the speed of the tip of the seconds hand of the clock.

Answer» a) A body is said to be uniform circular motion when the body moves in a circular path with uniform speed. Examples of uniform circular motion is:

i) Motion of artificial satellites around the earth.

ii) Cyclist moving in a circular track.

b) The speed of the body moving along a circular path is given as:

v = (2πr)/t

Given,

t = 60s

r = 10.5 cm = 0.105 m

v = (2πr)/t

v = 0.011 m/s


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