A slow-running pendulum clock can be speeded up by_______________?
Correct answer: D. Reducing the length of the rod
- A. Increasing the length of the rod
- B. Increasing the weight of the bob
- C. Reducing the weight of the bob
- D. Reducing the length of the rod
Explanation
A pendulum's period increases with the square root of its length, so shortening the rod makes each swing quicker and speeds up the clock. The bob's weight does not determine the period.
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Everyday physics explains motion, force, work, power, pressure, heat, light, sound and electricity through familiar devices and natural events. Topics include simple machines, friction, expansion, reflection and refraction, lenses, household circuits, electrical safety and magnetism, with mass distinguished from weight and heat distinguished from temperature.
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