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IB Physics HL A.2.25 Vertical Circular Motion and Acceleration

Practise analysing acceleration components on a rotating platform and distinguishing tangential motion from inward acceleration.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • Distinguish inward centripetal acceleration from tangential motion in a rotating system.

A.2.25—Direction change in circular motion question 1

[Maximum number: 2]

Aibhe and Euan are sitting on opposite sides of a merry-go-round, which is rotating at constant speed around a fixed centre. The diagram below shows the view from above.

Figure for Question A.2.25—Direction change in circular motion question 1 — IB Physics HL

Aibhe is moving at speed 1.0 m s−11.0 \mathrm{~m} \mathrm{~s}^{-1} relative to the ground.

The diagram below shows a side view of Aibhe and Euan on the merry-go-round.

Figure for Question A.2.25—Direction change in circular motion question 1 — IB Physics HL

Explain why Aibhe feels as if her upper body is being "thrown outwards", away from the centre of the merry-go-round.

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