Inertia investigation

Today i was playing with sheamus with the tennis ball we were kicking it around 

I think kne example of a situation where something move while some stay still was when the one of the table cloth. Where you put the table cloth on top of the table and put the books on top and pull the cloth off the table without moving the books

I think this is an example i was making a paper airplane in mr.Fosters class and threwit at the end of class