| Date | November 2016 | Marks available | 2 | Reference code | 16N.3.SL.TZ0.9 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 0 |
| Command term | Explain | Question number | 9 | Adapted from | N/A |
Question
The diagram shows two methods of pedalling a bicycle using a force F.
In method 1 the pedal is always horizontal to the ground. A student claims that method 2 is better because the pedal is always parallel to the crank arm. Explain why method 2 is more effective.
Markscheme
in method 1 the perpendicular distance varies from 0 to a maximum value, in method 2 this distance is constant at the maximum value
OR
angle between F and r is 90° in method 2 and less in method 1
OR
Γ = F × perpendicular distance
perpendicular distance/ torque is greater in method 2
Examiners report
[N/A]
Syllabus sections
Option B: Engineering physics » Option B: Engineering physics (Core topics) » B.1 – Rigid bodies and rotational dynamics
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