Law of universal gravitation
Answers are for parents and teachers.
1
How does gravitational force depend on distance?
Inversely proportional to the square of the distance.
2
If both masses double and r is unchanged, by what factor does the force grow?
4
3
If the distance grows 5 times, by what factor does the force decrease?
25
4
Why does the Moon not fall to Earth but circles it?
Gravity acts as the centripetal force keeping the Moon in orbit, while its speed keeps it from falling in.
5
Why do we feel the Earth’s pull but not the pull of a nearby mountain?
The Earth’s mass is enormous; a mountain’s is tiny in comparison.