Page 4 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PHYSICS PSPM SEM 1 1999 - 2017

PSPM 2003/2004 SF017/2 No. 11(b)(i), (ii), (iii)

14.
Z


FIGURE 6.5

FIGURE 6.5 shows a particle at rest on the highest part of a slippery hemisphere of
radius r. When released, the particle slides downwards until it breaks loose from the
hemisphere surface.

(a) Draw all the forces acting on the particle after it is released and when it is still
touching the hemisphere. [2 m]

(b) Based on your drawing in (a), what is the resultant force of these forces. [1 m]

(c) Determine the force that vanishes the moment it breaks loose from the
hemisphere. [1 m]

PSPM 2008/2009 SF017/2 No. 11(c)

15.

0.6 m

0.5 m 0.5 m

FIGURE 6.6

FIGURE 6.6 shows a 0.3 kg object attached to a horizontal rod by two strings, each of
-1
length 0.5 m. The object is whirled with speed 8.0 m s around the axis of the rod.
Calculate the tension in the string when the object is at the

(a) lowest point. [5 m]

(b) highest point. [5 m]

4