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

Calculate the normal force from the component of weight perpendicular to an inclined contact surface, including the correct mass, angle and trigonometric relationship.
Predict how the normal force changes when the contact angle or other stated force conditions change, while keeping the force perpendicular to the surface.

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Study A.2.6—Normal force conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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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} ;

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IB Physics SL A 2 6 Normal Force Questions question 1