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This video discussed the difference between absolute gravity and perceived gravity. It talked about how an object in free fall is weightless but still experiences gravity. It explained how G-force is not the same as gravity, because it can also be caused by acceleration, and it even showed some interesting experiments that demonstrate some of the concepts that were talked about.

In this video professor Lewin does a great job of debunking common misconceptions of gravity (like the idea that heavy objects fall faster) with fun and intuitive experiments, It is a great introduction to physics concerning gravity.

In this video Professor Lewin does a great job of introducing some of the principles of rotation. He does several demonstrations of artificial gravity with a centrifuge and then with a bucket and rope. The video provides a great introduction to the mechanics of rotation.