Page 50 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PHYSICS PSPM SEM 1 1999 - 2017

PSPM 2011/2012 SF016/2 No. 3(b)

23.
P

53
75 cm
R

Q

FIGURE 5.12

FIGURE 5.12 shows a 0.8 kg pendulum bob being released from rest at P. Calculate
the

(a) work done by gravity on the bob at R. [2 m]

(b) speed of the bob at Q. [2 m]

UPS 2012/2013 SF016 No. 4(b)

24. The mass of a carbon atom is 20 g.

-1
(a) Calculate the kinetic energy of the model moving with a speed of 2 m s . [2 m]

(b) Two carbon atom models are joined by a spring. The energy of the spring is equal
to the kinetic energy in part (b)(i). If the spring is stretched 10 mm, calculate the
spring constant. [3 m]

PSPM 2012/2013 SF016/2 No. 3(a)

25. A 0.5 kg box is initially at rest on a smooth horizontal surface. It is acted upon by a
-1
horizontal force for a distance of 3 m. If the final speed of the box is 5 m s , calculate
the magnitude of the force. [3 m]

UPS 2013/2014 SF016 No. 4(b)(ii)

26. A 2 kg stone is dropped from the top of a 10 m high building. By using the principle of
conservation of energy, calculate the kinetic energy of the stone when it is at a point
4 m above the ground.
[4 m]

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