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Circular Motion Physics
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Circular Motion Physics
Part 1: Understanding Circular Motion
Choose the best answer for each question.
1. An object moving in a circle at constant speed is accelerating because:
Its speed is increasing
Its direction is continually changing
Its mass is changing
No force acts on it
2. What is the direction of centripetal force on an object moving in a circle?
Away from the centre
Tangential to the circle
Towards the centre
Vertically upwards
3. Which equation gives centripetal acceleration?
a = v ÷ r
a = v² ÷ r
a = r ÷ v²
a = m × v
4. If the speed of an object is doubled while its circular path has the same radius, its centripetal force will:
Stay the same
Double
Become four times larger
Become half as large
Part 2: Applying Circular Motion
Show your working. Use g = 9.8 m/s² where needed.
5. Explain why a car turning around a flat corner needs friction between its tyres and the road.
6. A 2.0 kg object moves in a circle of radius 0.50 m at a speed of 4.0 m/s. Calculate its centripetal acceleration.
Formula: a = v² ÷ r
7. Using your answer to Question 6, calculate the centripetal force acting on the object.
Formula: F = m × a
8. A cyclist travels around a circular track. At which point is the cyclist's velocity changing: while travelling straight, while turning, or both? Explain your answer.
9. Draw and label a force diagram for a ball attached to a string as it moves in a horizontal circle. Include the direction of the centripetal force.
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