CAIE IGCSE Physics Drag in a Liquid

Practise accounting for water resistance when a powered object moves through a liquid, distinguishing engine force from the smaller resultant force causing motion.

Exam points

include the backward water-resistance force when relating a ship's engine force to its resultant force

[Maximum number: 1]

A ship sails in a straight line between two ports.
Fig. 1.1 shows the speed-time graph of the ship for the first 100 minutes of its journey between the two ports.

Fig. 1.1

At a time not shown on the graph, the acceleration of the ship is $0.0087 \mathrm{~m} / \mathrm{s}^{2}$ . The total mass of the ship and its passengers is $2.3 \times 10^{7} \mathrm{~kg}$ .

Explain why the force on the ship due to the ship's engine is greater than the value you calculated in (c)(i).

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1.5.1.7—Friction (drag) acts on an object question 1