Equals and opposites. What's happening in these examples?

Sometimes it is easy to see the laws of physics when experiments are done in zero gravity.

Have a look at some or all of these movies - they each show different aspects of forces and movement. What do you think is happening - and why?

You can type your explanations into word processing software such as Word, or into a text editor such as NotePad. Save your notes and keep a printout if you want to. You can compare your ideas with other students or your teacher.