To analyze how the amount of force the extraterrestrial athletes exert to move would change when they travel from the Moon to Earth, we need to consider the difference in gravitational forces between the two celestial bodies.
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Gravity on the Moon: The Moon has about 1/6th the gravitational pull of Earth. This means that objects on the Moon weigh significantly less compared to their weight on Earth.
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Gravity on Earth: Earth has a stronger gravitational pull, meaning that objects (and beings) weigh more and require more force to move against this gravitational force.
Now, considering the options provided:
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The force needed would be less, so they would perform at a higher level. (This is incorrect; the force needed would increase on Earth due to stronger gravity.)
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The force would need to be greater, so they would not perform as well. (This is correct; more force is necessary to move against a stronger gravitational pull.)
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The force needed to move on the Earth is less than the force needed to move on the moon. (This is incorrect; the opposite is true.)
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The force would be the same. (This is incorrect, as the force required to move would change due to the difference in gravity.)
Therefore, the correct response is: The force would need to be greater, so they would not perform as well.