5.2 Gravitational Fields

Question 1

Gravitational field strength

Answer 1

,g, at a point Is = to the force experienced per unit mass
- In N kg-1

Question 2

Newtons law of universal gravitation

Answer 2

-Between any 2-point masses there exists an attractive force
-which is directly proportional to the product of the masses,
-and inversly proportional to the square of their separation

Question 3

Keplers 3rd law

Answer 3

• T2➰r3
  -The square of their period of revolution, (T)
  -is directly proportional to the cube of their mean distances, (r) from it