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CAIE A-Level Physics 12.2.4 Using F = mrω² and F = mv²/r

Practise calculating centripetal force or an unknown circular-motion quantity, identifying the supplying force and interpreting its inward direction.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • calculate centripetal force using F = mrω² or F = mv²/r
  • rearrange the relationships to determine mass, radius, speed or angular speed
  • identify the physical force supplying the centripetal force and interpret its direction

12.2.4—F = mrω2 and F = mv2 / r question 1

[Maximum number: 3]

A second piece of modelling clay is attached to the disc in the position shown in Fig. 1.2.

Fig. 1.2

Fig. 1.2

The second piece of modelling clay has a larger mass than the first piece.
By placing one tick (✓)(\checkmark) in each row, complete Table 1.1 to show how the quantities indicated compare for the two pieces of modelling clay.

Table 1.1

Table 1.1

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