Catapult physics is basically the use of stored energy to hurl a projectile (the payload), without the use of an explosive. The three primary energy storage mechanisms are tension, torsion, and gravity.The catapult has proven to be a very effective weapon during ancient times, capable of inflicting great damage.atapult physics is basically the use of stored energy to hurl a projectile (the payload), without the use of an explosive. The three primary energy storage mechanisms are tension, torsion, and gravity. The catapult has proven to be a very effective weapon during ancient times, capable of inflicting great damage.
Assembling the Armor. 1  1. Shape and contour the craft foam to your body. 2  2. Glue the craft foam together wherever the pieces were designed to overlap. 3  3. Reinforce and stiffen the armor.  4. Work in 1  sections. 5. Leave openings.  6. Decide how to attach the armor to your body.
Depiction of a horned helmet from Plate C of the Gundestrup cauldron (c. 150-1 BC). In fact, the Vikings made their helmets of several pieces of iron riveted together, says Hurstwic.org : âBoth before and after the Viking era, helmet bowls were made from one piece of iron, hammered into shape. However, during the Viking era, helmets typically were made from several pieces of iron riveted together, called a spangenhelm style of helm. It's easier to make a helmet this way, requiring less labor, which may be why it was used.