Physics 5054/22 — May/June 2014

Cambridge O-Level · Theory · worked solutions for every part, with the mark scheme

questions

marks

105

minutes

Topics Kinematics · Energy, Work and Power · Thermal Properties of Matter · Forces · Mass, Weight and Density · Pressure · +12 more

Q1ForcesMass, Weight and DensityKinematicsFree sample

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

Fig. 1.1

(a)

The driving force on the lorry in the forward direction is $D$ and the total backward force on the lorry is $B$ .

(i)

State and explain whether $D$ or $B$ is the larger force.

(ii)

Suggest one possible cause of the backward force $B$ .

(b)

The weight of the lorry is $300\,000\text{ N}$ .
The gravitational field strength $g$ is $10\text{ N / kg}$ .

(i)

Calculate the mass of the lorry.

mass = ______

(ii)

The resultant force on the lorry is $15\,000\text{ N}$ . Calculate the acceleration of the lorry.

acceleration = ______

(c)

Later, the lorry turns a corner at constant speed.

Explain why the lorry accelerates even though the speed is constant.

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