Discussion
Two types of measuring devices - the beam balance and the spring balance - are commonly used in shops. If we take them to the Moon, which of the following will give the same reading for a given object as it does on the Earth ?
Answer: A
Only the beam balance gives the same reading on the Moon.
A beam balance compares the unknown mass with standard masses. Gravity acts equally on both pans, so the weaker lunar gravity cancels out and the balance still reads the object's mass correctly.
A spring balance measures weight, the force of gravity on the object, by how much the spring stretches. On the Moon, where gravity is about one-sixth of the Earth's, it would read about one-sixth as much. So the spring balance, and the options that include it, give a different reading.
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