IB Physics HL A 2 1 Newtons Three Laws of Motion Questions

Practise analysing HL force systems, including variable drag, orbital motion, propulsion and action-reaction pairs.

Exam points

State and apply Newton’s first law to identify inertial motion and the conditions for zero resultant force.
Use Newton’s second and third laws to relate resultant force, mass and acceleration and to identify equal-and-opposite interaction pairs from complete 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 HL A 2 1 Newtons Three Laws of Motion Questions question 1 — IB Physics HL

Explain, using Newton's first law of motion, why the resultant force on the skier must be zero.

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IB Physics HL A 2 1 Newtons Three Laws of Motion Questions question 1