image from Pixabay

It turns out that gravity can be described as either a theory or a law.

Law:

Every time I pick up something and let it og, it falls to the ground. This is repeatable and I can masure the rate of fall through equations. Acceleration due to gravity: 

g = 9.8 m/s/s, downward
( ~ 10 m/s/s, downward)

Theory:

Just two ways to explain gravity (there are more out there) (very simplified):

• Newton's Law of Universal Gravitation - Two masses exert a pull on each other. This gets stronger as they get closer together. 
• Einstein's Space-time - Space-time is like a fabric, as masses sit on it, it bends, pulling other objects towards the mass. 

In this session, we will exlore the effects of gravity on the Sun-Earth-Moon system.