Physics - Newton's Law of Gravitation

Force of gravity is proportional to

1/r²

density\=

mass/volume

Gravitational field

a region of space where a mass experiences a force

Field strength

force per unit mass on a small test mass, placed at that point in the field

Inside the mass

the mass outside of the smaller mass' radius doesn't count towards gravity, it 'cancels out' (must have uniform density)

field strength and radius graph

linear increase from 0 to R (radius of larger mass), then decreases as a curve