Catapults have been used through history and have a common caractoristic. Down below are different ecample performing a task of changing forms of energy.

This is a design used in Roman history as a siege weapon. Forces are from what part or device to the projectile.
 


Sporting Events 

Archery with Bow and arrow. Forces are from what part or device to the projectile.

Steam assist take off is currently used by the U.S. military. Forces are from what part or device to the projectile.

  
 

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