DP Physics (last assessment 2024)
Question 20N.2.SL.TZ0.2a
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.2.SL.TZ0.2a |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Draw, Label | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
20N.2.SL.TZ0.2a
The Rotor is an amusement park ride that can be modelled as a vertical cylinder of inner radius rotating about its axis. When the cylinder rotates sufficiently fast, the floor drops out and the passengers stay motionless against the inner surface of the cylinder. The diagram shows a person taking the Rotor ride. The floor of the Rotor has been lowered away from the person.
(a)
Draw and label the free-body diagram for the person.
[2]
Markscheme
arrow downwards labelled weight/W/ and arrow upwards labelled friction/ ✓
arrow horizontally to the left labelled «normal» reaction/ ✓
Ignore point of application of the forces but do not allow arrows that do not touch the object.
Do not allow horizontal force to be labelled ‘centripetal’ or .