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19 May, 13:02

Explain why the weight of an object is different on earth and on moon even though the objects mass is the same in both place.

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  1. 19 May, 14:07
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    Weight = mass x gravitational field strength

    Gravitational field strength is determined by two factors: how large the planet/moon/body is, and how close the object is to that body. Discounting the second factor (which has a minute effect on field strength over distances below 100km or so), the size of the planet/moon/body is proportional to the field strength.

    On Earth, the field strength is roughly 9.81N/kg (where kg is the SI unit of mass and Newtons are the SI unit of weight) - this means that every kilo of mass weighs just less than 10N here.

    Conversely on the moon, the field strength is roughly 1.6N/kg, meaning that every kilo weighs only 1.6N there. The field strength is so much smaller because the moon has less that 1/81th of the Earth's mass.

    In conclusion, take the example of a a 5kg bowling ball: on Earth it would weigh 5 * 9.81 = 53.955N whereas on the moon it would weigh 5 * 1.6 = 8kg. They have the same mass in both places, but weigh very different amounts.
  2. 19 May, 14:11
    0
    The Mass of the Earth is larger than that of the moon resulting in a larger Fg because the strength of gravity on earth is stronger.
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