Conceptual: Law of Universal Gravitation and Tides

Today we talked the Law of Universal Gravitation:

And we practiced a bit with Universal Gravitation.

Then we went over some consequences of the fact that gravity is weaker at larger distances: tides and black holes. If you missed the notes, the Wikipedia acticlte on tides is quite good. For our class, we care about what causes the basic tides, spring tides, and neap tides. You will not be held responsible for all the details in the Wikipedia article...although the whole subject is quite fascinating. 

Here is a video we watched of the very dramatic tides in the Bay Of Fundy.

Here is a video of the amazing Neil DeGrasse Tyson explaining black holes. My pictures are backwards from his explanation - I drew a person diving in, while he talks about a person going in feet first.

Homework: Tides