21.3Newton's laws of gravitation

Question 1

What is Kepler’s third law?

Answer 1

Kepler’s third law states that the value of r^3/T^2 is the same for all planets

r = average radius of its orbit
T = Time for one orbit of the sun

Question 2

Define newtons law of gravitation

Answer 2

Gravitational force is equal to the constant G multiplied by the two masses, all divided by the radius squared

It is proportional to the two masses and inversely proportional to the radius squared