DP Physics (last assessment 2024)
Question 19M.3.SL.TZ2.8c
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.SL.TZ2.8c |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Determine | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
19M.3.SL.TZ2.8c
A uniform ladder of weight 50.0 N and length 4.00 m is placed against a frictionless wall making an angle of 60.0° with the ground.
(c)
The coefficient of friction between the ladder and the ground is 0.400. Determine whether the ladder will slip.
[2]
Markscheme
maximum friction force = «0.4 × 50N» = 20«N» ✔
14.4 < 20 AND so will not slip ✔
Examiners report
The question about the slipping of the ladder was poorly answered. The fact that the normal reaction on the floor was 50N was not known to many.
