Introduction What is a catapult A catapult is

Introduction: What is a catapult? A catapult is a machine that shoots objects into the air. It was often used as a weapon - to shoot large boulders at the enemy. Basically, it’s a large lever.

History of the Catapult Ø Catapults were the first form of field artillery used by the Greeks. ØThe word Catapult means “shield piercer”. ØThe first catapults were based on the bow and arrow. ØThey were called Ballista, and they shot spears.

History of the Catapult ØIt was difficult to construct, so the Romans developed the Mangonel. ØIt is the type of catapult that we are most familiar with. ØThe catapult was slowly replaced by gunpowder artillery during the 14 th and 15 th centuries.

Trajectory / Launch Concepts v. Trajectory: the path a projectile makes through space under the action of given forces such as thrust, wind, and gravity.

A Simple Catapult: 18. 5 cm 16 cm 21. 5 cm 11 cm

Fantastic Factfile: Machines A Machine is a simple device used to make work easier. There are six basic simple machines: An inclined plane is a slanted surface that increases the distance, but decreases the work. A ramp is an inclined plane. A screw is an inclined plane wrapped around a bar. A corkscrew is a type of screw. A wedge is a movable inclined plane. The blade of a knife is a wedge. A lever is a bar that pivots around a fulcrum. A crowbar is a type of lever. A wheel and axle is a cylindrical drum and wheel mounted on the same axle. A pulley consists of a wheel and a rope or string that is wrapped around it. Pulleys can change direction of a force as well as increase the mechanical advantage.

What is Force? A force is a push, pull, or lift. Effort force - the force applied to a machine Resistance force - the force that opposes the effort force (weight) Efficiency- the comparison of work output to work input Mechanical advantage - the number of times a machine multiplies the effort force

Conclusion A catapult is a machine that shoots objects into the air. It was often used as a weapon. It is a lever - one of the six types of machines. Machines make work easier.

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