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

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.SL.TZ0.7b
Level SL Paper 3 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
20N.3.SL.TZ0.7b

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.

(b)

Explain the changes to the rotational kinetic energy in the person-turntable system.

[2]

Markscheme

the rotational kinetic energy has increased ✓

energy is provided by the person doing work «flipping the wheel» ✓

 

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