DP Physics (last assessment 2024)
Question 17N.2.SL.TZ0.1e.i
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.2.SL.TZ0.1e.i |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Show that | Question number | e.i | Adapted from | N/A |
e.i.
[Maximum mark: 3]
17N.2.SL.TZ0.1e.i
A girl on a sledge is moving down a snow slope at a uniform speed.
The sledge, without the girl on it, now travels up a snow slope that makes an angle of 6.5˚ to the horizontal. At the start of the slope, the speed of the sledge is 4.2 m s–1. The coefficient of dynamic friction of the sledge on the snow is 0.11.
(e.i)
Show that the acceleration of the sledge is about –2 m s–2.
[3]
Markscheme
«friction force down slope» = μmg cos(6.5) = «5.9 N»
«component of weight down slope» = mg sin(6.5) «= 6.1 N»
«so a = » acceleration = = 2.2 «m s–2»
Ignore negative signs
Allow use of g = 10 m s–2
