Page 39 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PSPM SP015

UPS 2011/2012 SF016 No. 3(b)(i)

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32. A car travelling at 30 m s comes to rest at a distance of 60 m. If the mass of the car is
2000 kg, calculate the constant force that causes the car to stop at that distance. [4 m]

UPS 2012/2013 SF016 No. 3(b)

33. A lift of mass 1200 kg is supported by a cable. Calculate the tension in the cable when
the lift is

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(a) accelerating uniformly upwards at 2.0 m s . [3 m]

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(b) moving downwards with a uniform velocity of 3.0 m s . [3 m]

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

34.
F
60

2.0 kg

FIGURE 4.23

FIGURE 4.23 shows a 2.0 kg block is being pushed along a rough horizontal surface
by a force F = 30 N at an angle 60 from the normal.

(a) Sketch a free body diagram for the block. Use common symbol for each force.
[2 m]

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(b) If the block moves at constant acceleration 0.5 m s , calculate the coefficient of
friction. [6 m]

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