Here is the link for the start of the space and gravity unit we did today:
https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0BzFUvVu_WNI_NzQ2ZWY5OTUtZWNiMy00NjgzLWJiOTEtZDcyZmZkZGZhNDMw&hl=en
I'm not sure why the last slide doesn't read properly, it was meant to be the table of the differences between mass and weight.  If you can't remember these, look back through the earlier slides to help you with definitions.