IB Physics SL A.2.6 Normal Reaction Force

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

Exam points

Resolve perpendicular weight components to calculate normal reaction force on a slope.

[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 A.2.6—Normal force 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

A.2.6—Normal force question 1