Multiple choice

Uranus is twice as close to the Sun as Pluto. The force of the Sun's gravity for Uranus is...

  1. two times stronger than it is for Pluto

  2. four times stronger than it is for Pluto

  3. one fourth as strong as it is for pluto

  4. one half as strong as it is for Pluto
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gravity follows the inverse-square law, meaning force is proportional to 1/r^2. If the distance is halved, the force increases by a factor of 2^2, which is 4.

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