| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.SL.TZ0.7 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 7 | Adapted from | N/A |
Question
A force which increases uniformly from 0 to a maximum value of F is applied to an object. The object does not move until the force exceeds 0.5F. As the force increases from 0.5F to F the object moves a distance x in the direction of the force. What is the work done by this force?
A. 0.25Fx
B. 0.5Fx
C. 0.75Fx
D. Fx
Markscheme
C
Examiners report
This question proved to be difficult for candidates with many opting for the distractors B and D. Candidates should know that in calculating work done by a varying force Faverage needs to be used rather than the initial or final force.
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