Sometimes it's easier to see the laws of physics when experiments are done in zero gravity.

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What is meant by inertia?

How is it possible to jump out of a plane thousands of metres in the air and still land safely?

To win at tug-of-war you have to overcome inertia.

Have a look at some or all of these movies - they each show different aspects of forces and movement. You can just watch the movies or use the controls to delve a bit deeper.