DP Physics (last assessment 2024)
Question 19M.3.SL.TZ2.8a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.SL.TZ2.8a |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19M.3.SL.TZ2.8a
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.
(a)
Outline why the normal force acting on the ladder at the point of contact with the wall is equal to the frictional force F between the ladder and the ground.
[1]
Markscheme
«translational equilibrium demands that the» resultant force in the horizontal direction must be zero✔
«hence NW = F»
Equality of forces is given, look for reason why.
Examiners report
Many candidates stated that the resultant of all forces must be zero but failed to mention the fact that horizontal forces must balance in this particular question.
