O-LevelPhysicsForces5054/22 · May/June 2014 · Q16 Marks

Fig. 1.1 shows a lorry accelerating in a straight line along a horizontal road. [Figure 1.1]

(a)(i)State and explain whether D or B is the larger force.[1]
(a)(ii)Suggest one possible cause of the backward force B.[1]
(b)(i)The weight of the lorry is 300000N. The gravitational field strength g is 10N/kg. Calculate the mass of the lorry.[1]
(b)(ii)The resultant force on the lorry is 15000 N. Calculate the acceleration of the lorry.[2]
(c)Later, the lorry turns a corner at constant speed. Explain why the lorry accelerates even though the speed is constant.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.

[B1] (a) (i) D and either lorry accelerates (forward) or resultant force is forward
[B1] (ii) air resistance or (air) drag or friction (between tyres and road)
[B1] (b) (i) 30000 kg
[C1] (ii) (a=) F/m algebraic in any form or numerical
[A1] 0.5(0) m/s²
[B1] (c) direction or velocity is changing or acceleration or force is sideways or towards centre (of circle)

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