Starting and stopping - pushing and pulling. Sometimes it's easy and sometimes it's difficult. 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 the annotations text box below (using a name and password to save and recall) and then compare your ideas with other students or your teacher.