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Question 20N.3.SL.TZ0.7a

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.3.SL.TZ0.7a
Level SL Paper 3 Time zone TZ0
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 3]
20N.3.SL.TZ0.7a

The first diagram shows a person standing on a turntable which can rotate freely. The person is stationary and holding a bicycle wheel. The wheel rotates anticlockwise when seen from above.

© International Baccalaureate Organization 2020.

The wheel is flipped, as shown in the second diagram, so that it rotates clockwise when seen from above.

© International Baccalaureate Organization 2020.

(a)

Explain the direction in which the person-turntable system starts to rotate.

[3]

Markscheme

«person rotates» anticlockwise ✓

the person gains angular momentum «in the opposite direction to the new wheel motion» ✓

so that the total angular momentum is conserved ✓

 

OWTTE

Award [1 max] for a bald statement of conservation of angular momentum

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