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Question 18M.3.SL.TZ2.6b.ii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ2.6b.ii
Level SL Paper 3 Time zone TZ2
Command term Describe Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 2]
18M.3.SL.TZ2.6b.ii

A wheel of mass 0.25 kg consists of a cylinder mounted on a central shaft. The shaft has a radius of 1.2 cm and the cylinder has a radius of 4.0 cm. The shaft rests on two rails with the cylinder able to spin freely between the rails.

M18/4/PHYSI/SP3/ENG/TZ2/06

The wheel leaves the rails at point B and travels along the flat track to point C. For a short time the wheel slips and a frictional force F exists on the edge of the wheel as shown.

M18/4/PHYSI/SP3/ENG/TZ2/06.b

(b.ii)

Describe the effect of F on the angular speed of the wheel.

[2]

Markscheme

force gives rise to anticlockwise/opposing torque on

wheel ✓ so angular speed decreases ✓

 

OWTTE

[2 marks]

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