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The Earth is about 81 times more massive than the moon.?
The Earth is about 81 times more massive than the moon. During the gravitational interation of the Earth and the Moon, the magnitude of the gravitational force acting on the Earth ____ the gravitational force acting on the Moon.
a) greater than
b) less than
c) the same as
d) not enough information
4 Answers
- Andrew SmithLv 74 years ago
The question is badly worded.
Some people have interpreted it as the force of earth on some object vs the force of the moon on some object.
Whereas the question INTENDED to ask
"What is the magnitude of the gravitational force of the earth ACTING ON THE MOON compared to the magnitude of the gravitational force of the moon ACTING ON THE EARTH".
There are many forces but these two are the action and reaction forces to each other.
"Every action has an equal and opposite reaction" so these two forces must be the same at any and all times.
- twopairacesLv 44 years ago
This is a question testing your understanding of Newton's Third Law. Gravitational forces are force-pairs. The Earth pulls on the Moon with some force F, so the Moon pulls on the Earth with some force that is also F. Therefore, the answer is C.
- Anonymous4 years ago
Yes.
Earth: 5.972 × 10^24 kg
Moon: 7.348 × 10^22 kg
5.972 × 10^24 / 7.348 × 10^22 = 81.273816004354926510615133369624...
