Space > 3. The Solar System is Held Together by Gravity >
Solve problems and analyse information using: 
- Describes strength of the force between two objects.
- F = force, G = gravitational constant (6.67 x 10-11), m1 = mass of object 1, m2 = mass of object 2, d = distance between the two objects.
- Questions will generally involve being given three of the four variables (F, m1, m2, or d), and having to find the fourth.
- To find the unknown variable, isolate it on the left-hand side of the equation.