DP Physics (last assessment 2024)
Question 18M.3.SL.TZ1.d.i
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.SL.TZ1.d.i |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | d.i | Adapted from | N/A |
d.i.
[Maximum mark: 2]
18M.3.SL.TZ1.d.i
A constant force of 50.0 N is applied tangentially to the outer edge of a merry-go-round. The following diagram shows the view from above.
The merry-go-round has a moment of inertia of 450 kg m2 about a vertical axis. The merry-go-round has a diameter of 4.00 m.
A child of mass 30.0 kg is now placed onto the edge of the merry-go-round. No external torque acts on the system.
The child now moves towards the centre.
Explain why the angular speed will increase.
[2]
Markscheme
moment of inertia will decrease
angular momentum will be constant «as the system is isolated»
«so the angular speed will increase»
[2 marks]
