Page 3 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PSPM SP015

PSPM JUN 1999/2000 SF015/2 No. 4

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11. An object of 2.5 kg mass is rotated in a vertical circle at a speed of 5.0 m s . Determine
the centripetal force of the object. Also calculate the maximum and minimum tension of
the string between the object and the centre of the circle if the radius of the circle is
2.0 m. [4 m]

UPS 2001/2002 SF015 No. 5(a)

12.



FIGURE 6.3

A body of mass 2.3 kg is hung freely from a piece of string of 162 cm long. The body is

circulated horizontally so that the string makes an angle  with the vertical line as
shown in FIGURE 6.3.

(a) Draw all the forces acting on the body. [2 m]

(b) If the tension of the string cannot exceed 50 N, calculate the maximum angle  so
that the string does not break and its maximum speed. [6 m]

PSPM 2003/2004 SF017/2 No. 2

13.



r


FIGURE 6.4
A pendulum with length L makes a circular motion in the horizontal plane as shown in
FIGURE 6.4. If the cord of the pendulum makes an angle  with the vertical axis, find
the rotating frequency of the pendulum in terms of its radius r, , and acceleration due
to gravity, g. [4 m]

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