Page 38 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PHYSICS PSPM SEM 1 1999 - 2017

PSPM 2005/2006 SF017/2 No. 1

29.
F

FIGURE 4.21

A block of mass 2 kg is pushed along a horizontal surface with a force F = 3.2 N as
-2
shown in FIGURE 4.21. The block experiences an acceleration a = 0.3 m s . What is
the coefficient of friction between the block and the horizontal surface? [4 m]

PSPM 2009/2010 SF017/2 No. 10(b)

30.
m 1


m 2

FIGURE 4.22

FIGURE 4.22 shows a block of mass m 1 = 6.0 kg on a horizontal surface with
coefficient of kinetic friction,  k = 0.22 is connected by a string through a pulley to
another block of mass m 2 = 3.0 kg. The system is released from rest.

(a) Draw the forces acting on the blocks when they are in motion. [2 m]

(b) Calculate the acceleration of the blocks. [5 m]

(c) Calculate the tension in the string. [2 m]

UPS 2010/2011 SF017 No. 3(b)

31. A box of mass m is weighed on a spring scale attached to the ceiling of a lift. The lift
accelerates with constant acceleration, a.

(a) State the direction of lift motion when the spring scale reads a value that is greater
than the weight of the box. With the aid of a free body diagram, explain your
answer. [4 m]

(b) Calculate the apparent weight of the box of mass 0.5 kg if the lift moves
-2
downward with constant acceleration 2.0 m s . [4 m]

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