Catapult+log+book

Day 1: Introduction day A military machine for hurling missiles, such as large stones or spears, used in ancient and medieval times. A catapult was a large machine on wheels with a basket attached to a long wooden arm and a power source for hurling projectiles on the other. The first catapult however was invented around 400 BC in Greek town Syracus.

Day 2: Quick build Variables dealt with are how far to pull back, how to construct the nails and which size rubber bands to use. Force-Strength or energy as an attribute of physical action or movement. Energy-The strength and vitality required for sustained physical or mental activity. Day 3&4: Science investigation The rubber bands hold potential energy and when they are released all that energy is throwing the ball with it.

Day 5&6: We built a cheap version out of rulers, markers and tape. It successfully worked. Day 7&8: Best feature is our power and distance. Day 8&9: