| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.SL.TZ2.6 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 6 | Adapted from | N/A |
Question
A student makes three statements about situations in which no work is done on an object.
I. The object is moving with uniform circular motion.
II. A force is applied to the object in the direction of its velocity.
III. A force is applied to the object in a direction opposite to its motion.
Which of the above statements is/are correct?
A. I only
B. I and II only
C. I and III only
D. III only.
Markscheme
A
Examiners report
A few teachers commented that this question was too wordy. Yet the statistics show that most candidates understood that no work is done on a body if the force acts upon it at 90° to its motion, as is the case with circular motion.
