| Date | May 2017 | Marks available | 1 | Reference code | 17M.1.SL.tz0.18 |
| Level | Standard Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | Why | Question number | 18 | Adapted from | N/A |
Question
Why is the knee bent during the recovery phase of running?
A. To move the centre of gravity higher
B. To increase the length of the lever
C. To decrease the moment of inertia
D. To decrease angular velocity
Markscheme
C
Examiners report
Third most difficult question. Although many answered this incorrectly, responses were fairly evenly spread, indicating that candidates were largely unaware of rationale behind running phases.
Syllabus sections
- 20N.2.HL:.tz0.10e: The gymnast is performing a routine on the beam. Explain the influence of the position of the...
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18N.1.SL.tz0.20:
What happens to the centre of mass when the basketball player prepares to shoot, moving from position A to position B?
[Source: adapted from sdart/iStock]
A. Does not move
B. Moves upwards
C. Moves downwards
D. Moves forwards
- 18N.1.HL:.tz0.15: What happens to the centre of mass when the basketball player prepares to shoot, moving from...
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18N.2.HL:.tz0.4c:
Diagram A, shows a gymnast balanced on a beam. In Diagram B, she is about to fall. Explain how a fall can be avoided by moving the body and therefore the centre of mass.
A
B[Source: © Ranko Bojanovic/123RF.COM]
- 21N.1.SL.tz0.18: The diagram shows a gymnast. Which represents the correct location for the centre of mass?
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20N.1.SL.tz0.19:
The diagram shows a high jumper performing a Fosbury Flop. During which phase is the centre of mass outside the athlete?
[Source: © International Baccalaureate Organization 2020.]
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21M.1.HL:.tz0.15:
The diagram shows a pole vaulter clearing the bar. Which number represents the correct position of the centre of mass?
[Source: HAY JAMES G., THE BIOMECHANICS OF SPORTS TECHNIQUES,
4th Ed., ©1993 Reprinted by permission of Pearson Education, Inc.]A. 1
B. 2
C. 3
D. 4
