IB Physics HL A 2 25 Direction Change in Circular Motion Questions

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

Exam points

Explain that centripetal force changes the direction of velocity even when speed remains constant.
Relate tangential velocity, inward acceleration and centripetal force using complete circular-motion evidence.

[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 IB Physics HL A 2 25 Direction Change in Circular Motion Questions question 1 — IB Physics HL

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

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

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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IB Physics HL A 2 25 Direction Change in Circular Motion Questions question 1