EasyPhysicsHigh School (11–12)Waves & Sound › Oscillations and Simple Harmonic MotionNumericalConceptual
A pendulum has a period of 1.40 s on Earth…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A pendulum has a period of on Earth. An astronaut takes it to the Moon, where is one sixth of its value on Earth. (a) What is its period on the Moon? (b) The astronaut swaps the bob for one twice as heavy, keeping the length. What is the period now?
Need a reminder? The key ideaShow
A simple pendulum of length , for small angles:
In a lift or a car, use the gravity the bob feels, : in a lift speeding up upwards, speeding up downwards.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, compare your working with the solution.
(a) becomes six times smaller, so becomes times larger: .
(b) The mass does not appear in the formula. The period stays .
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