AQA, OCR
A Level
A Level Physics
Circular Motion (Answers)
Total Marks:/30
, 1. Total for Question 1: 10
(a) Define angular velocity. [1]
[3]
Solution: Rate of change of angular displacement: ω = θ/t
(b) Calculate the angular velocity of a car travelling at 30 kmhr−1 around a roundabout whose radius
is 50 m.
Solution: 1
rad
6
s−1
(c) Give three examples of situations in which centripetal forces arise, detailing precisely which forces [3]
contribute to the centripetal force.
Solution: Anything valid e.g. vehicles on banked turns (reaction/friction force), satellites in
orbit (gravity), yoyos being whirled (tension).
Page 2
A Level
A Level Physics
Circular Motion (Answers)
Total Marks:/30
, 1. Total for Question 1: 10
(a) Define angular velocity. [1]
[3]
Solution: Rate of change of angular displacement: ω = θ/t
(b) Calculate the angular velocity of a car travelling at 30 kmhr−1 around a roundabout whose radius
is 50 m.
Solution: 1
rad
6
s−1
(c) Give three examples of situations in which centripetal forces arise, detailing precisely which forces [3]
contribute to the centripetal force.
Solution: Anything valid e.g. vehicles on banked turns (reaction/friction force), satellites in
orbit (gravity), yoyos being whirled (tension).
Page 2
