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IB Physics HL A.2.2 Applications of Newton’s Laws

Practise analysing coupled blocks, frictional forces and multi-stage motion with Newton’s laws.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Analyse coupled-body force systems and friction on changing surfaces.
  • Use resultant-force reasoning to explain motion after a slope or contact interaction.

A.2.2—Forces as interactions between bodies question 1

[Maximum number: 3]

A girl on a sledge is moving down a snow slope at a uniform speed.

Figure for Question A.2.2—Forces as interactions between bodies question 1 — IB Physics HL

After leaving the snow slope, the girl on the sledge moves over a horizontal region of snow. Explain, with reference to the physical origin of the forces, why the vertical forces on the girl must be in equilibrium as she moves over the horizontal region.

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