Newton's Law of Gravity Video Lessons

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Problem: The gravitational force of a star on an orbiting planet 1 is F1. Planet 2, which is twice as massive as planet 1 and orbits at twice the distance from the star, experiences gravitational force F2.What is the ratio F2/F1? You can ignore the gravitational force between the two planets. Express your answer using two significant figures.

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Force:

F=GMmR2

Taking the mass of the star to be M, the mass of the planet 1 to be m1, the mass of planet 2 to be m2, R1 be the distance between the star and planet 1, and R2 be the distance between the star and planet 2:

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Problem Details

The gravitational force of a star on an orbiting planet 1 is F1. Planet 2, which is twice as massive as planet 1 and orbits at twice the distance from the star, experiences gravitational force F2.

What is the ratio F2/F1? You can ignore the gravitational force between the two planets. Express your answer using two significant figures.

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What scientific concept do you need to know in order to solve this problem?

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