Page 44 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PHYSICS PSPM SEM 1 1999 - 2017

PSPM CHAPTER 5: WORK, ENERGY AND POWER
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Work

UPS 2013/2014 SF016 No. 4(a)(i) Edited

1. Define work done and state its SI unit. [2 m]

PSPM 2005/2006 SF017/2 No. 10(b)

2.

30

FIGURE 5.1

A man pulls a 45 kg block at constant velocity on a rough surface as shown in
FIGURE 5.1. The angle between the rope and the horizontal is 30 and the coefficient
of kinetic friction between the block and the surface is 0.6.
(a) Sketch and label all the forces acting on the block. [2 m]
(b) Calculate the tension in the rope. [3 m]
(c) Calculate the work done on the block if the distance travelled is 3 m. [4 m]

UPS 2007/2008 SF017 No. 4(a)(i)

3. You lift a book with your hand in such a way that it moves up at constant speed. While
it is moving, the total work done on the book is zero. Explain. [2 m]

UPS 2014/2015 SF016 No. 4(a)(ii)

4. F (N)

31

0 s (m)
3 6
FIGURE 5.2

FIGURE 5.2 shows a graph of resultant force F against displacement s of a 8 kg
trolley. Determine the total work done on the trolley. [3 m]

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