1. Law of universal gravitation
Honors Physics

2. Zero Gravity Cats!

3. Universal Gravitation
ALL objects attract each other with a force of gravitational attraction. Gravity is universal. This force of gravitational attraction is directly dependent upon the masses of both objects and inversely proportional to the square of the distance that separates their centers.

4. ALL objectless are attracted to each other!

5. Gravity attracts the center of masses

6. The mathematical relationship

7. The mathematical relationship
What it means:
If you increase the mass of either object, you increase the force of gravity.
If you increase the distance between the objects, you decrease the force of gravity.

8. Proportional to the product of the masses
Start with some known force of gravity.
Double one mass  Double the force
Double both masses  Quadruple force
Triple one mass  Triple the force

9. Inversely proportional to the square of the distance
Start with some known force of gravity.
Double the distance  ¼ the force
½ the distance  Quadruple the force
Double the distance and both masses  get the same force