IB Physics SL A.2.5 Contact forces

Practise identifying contact forces in motion problems, so you can decide when they balance, oppose motion, or set a maximum speed.

Syllabus
First assessment 2025
Objective
—
Level
SL

Exam points

  • set drag equal to thrust in an equation to justify maximum speed when the resultant force is zero
  • use weight and drag on a free-body diagram to decide the resultant direction before applying F = ma

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