Page 32 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020
P. 32
PHYSICS PSPM SEM 1 1999 - 2017
PSPM 2003/2004 SF017/2 No. 3(b)
13.
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P
Q
FIGURE 4.8
1.5 kg body P is placed on a rough horizontal surface. It is attached to body Q by a
massless string as shown in FIGURE 4.8. When the weight of Q is slowly increased to
5 N, P starts to slide. Calculate the coefficient of friction of the rough surface.
[3 m]
PSPM 2004/2005 SF017/2 No. 10(b)
14.
B C
A 30
FIGURE 4.9
FIGURE 4.9 shows three blocks, A, B and C connected by two massless strings
passing two smooth pulleys. Blocks A and B are on rough surfaces of coefficient of
friction 0.3. The mass of each block A and B is 20 kg. Block C falls at constant
velocity.
(a) Draw three separate free body diagrams which show all the forces that act block
A, B and C.
[3 m]
(b) What is the tension of the rope connecting block A and B? [2 m]
(c) What is the mass of block C? [4 m]
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