it's easier to see the laws of physics when experiments are done in zero gravity.
is meant by inertia?
How is it possible to jump out of a plane thousands of metres in the air
and still land safely?
win at tug-of-war you have to overcome inertia.
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.