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IB Physics HL A 2 2 Forces As Interactions Between Bodies Questions

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

  • Identify the two bodies in a force interaction and state the direction and physical origin of the force each body exerts.
  • Determine the contact force between coupled bodies from the applied force, masses and common acceleration.
  • Explain how vertical contact forces balance or produce acceleration in situations such as a sledge, lift or load.

Learn this topic

Study A.2.2—Forces as interactions between bodies conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Physics HL A 2 2 Forces As Interactions Between Bodies Questions question 1

[Maximum number: 3]

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

Figure for Question IB Physics HL A 2 2 Forces As Interactions Between Bodies Questions 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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