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# Form 4 Physics Uniform Circular Motion Questions and Answers

(a) State two ways in which the centripetal force on a body of mass m can be increased.
(b) Figure 7 shows an object at the end of a light spring balance connected to a peg using a string. The object is moving in a circular path on a smooth horizontal table with a constant speed.

(i) State what provides the centripetal force.
(ii) Indicate with an arrow on the figure the direction of the centripetal force.
(iii) State a reason why the object is accelerating while its speed remains constant.
(iv) Given that the mass of the object is 0.5 kg and it is moving at a speed of 8 m/s at a radius of 2m, determine the reading on the spring balance.
(KCSE 2013 paper 1 question 14 (a) and (b))

(8m 46s)
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iv).Reading of the spring = centripetal force =(m times v times v)/r = (0.5 times 8 times 8)/2 = 16N