IB Physics SL A 2 6 Normal Force Questions

Practise resolving weight components and calculating normal reaction forces on slopes and inclined planes.

Exam points

Identify the normal force FN as the contact force acting perpendicular to the surface.
Resolve and calculate the normal force for horizontal or inclined contacts using complete force-diagram and mark-scheme evidence.

[Maximum number: 2]

This question is about the forces on a skier.

A skier is pulled up a hill by a rope at a steady velocity. The hill makes an angle of $12^{\circ}$ with the horizontal. The mass of the skier and skis is 73 kg . The diagram below shows three of the forces acting on the skier.

Figure for Question IB Physics SL A 2 6 Normal Force Questions question 1 — IB Physics SL

Calculate the magnitude of the normal reaction acting on the skier.

$\quad(N=) m g \cos \theta /$ correct substitution;

\left(=73 \times 9.81 \times \cos 12^{\circ}=\right) 700 \mathrm{~N} ;

All question bank results loaded

IB Physics SL A 2 6 Normal Force Questions question 1