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Question

An object weighs 18 N when measured on the surface of the earth. What would be its weight when measured on the surface of the moon?

The correct answer is

3 N

Weight is given by \(W = mg\), so it depends on the acceleration due to gravity at the place of measurement.

The gravity on the moon's surface is about one-sixth of that on the Earth's surface.

Since the mass of the object stays the same, its weight on the moon becomes one-sixth of its weight on Earth.

Weight on moon \(= \frac{18}{6} = 3\,\text{N}\).

Therefore, the object weighs 3 N on the surface of the moon.

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