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.
Steps. 1  1. Decide on the material or quality of armor you want. 2  2. Collect enough of your materials to make each piece of armor. 3  3. Craft your helmet by placing 3 of your material across the top, and 2 in the outside middle spaces of a crafting table.  4. Craft your chest piece by placing your material in every space but the top middle one.