Page 6 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020
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PHYSICS PSPM SEM 1 1999 - 2017
PSPM 2012/2013 SF016/2 No. 4(b)
19.
30
r
FIGURE 6.8
FIGURE 6.8 shows a bob revolves in a horizontal circle of radius r. The string has a
length of 0.5 m and makes 30 with the vertical.
(a) Sketch the free body diagram for the bob. [1 m]
(b) Calculate the speed of the bob. [5 m]
(c) Calculate the period of revolution. [2 m]
PSPM 2013/2014 SF016/2 No. 4(b)
20. A 60 cm conical pendulum bob revolves freely. The pendulum string makes an angle of
37 with the vertical.
(a) Sketch and label a free body diagram of the pendulum bob. [2 m]
(b) Calculate the speed of the pendulum bob. [3 m]
(c) Calculate the angular velocity of the pendulum bob. [2 m]
(d) If the angle remains unchanged but a longer string is used, will the angular
velocity decrease, same or increase? Justify your answer. [2 m]
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