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Catapults and PropulsionPowerPoint Presentation

Catapults and Propulsion

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### Catapults and Propulsion

Milbank High School

What are Catapults?

- A machine that stores energy then quickly releases this energy to fire a projectile
- Usually very large (larger than what a person can carry)
- Slingshots, bows, etc are “small” catapults

History of Catapults

- Developed from crossbows
- They just got larger and larger

- First developed in Greece in 3 or 4th Century B.C.
- Most were no longer used after the invention of____________
in the 14th century.

History of Catapults

- Projectiles
- Stones, arrows, boulders
- Dead, infected animals (biological warfare)
- Beehives

Types of Catapults

- Ballista
- Powerful crossbow
- Greeks, Romans
- Range of over
500 yards

Types of Catapults

- Mangonel
- Medieval period
- Romans
- Long distance,
bad accuracy

Types of Catapults

- Trebuchet
- Counterweighted
- Could throw 50-
100 kg objects

over 300 meters

and be fired once

every 15 seconds

Types of Catapults

- Trebuchet Con’t
- Sometimes threw larger stones (1500 kg) to break through walls
- Castles were built with lakes around them far enough so the trebuchets couldn’t get close enough to work
- http://www.cs.wisc.edu/~englet/catapult.html

Physics of Catapults

- http://www.cafepress.com/buy/engineering/-/pv_design_prod/pg_1/p_storeid.76346291/pNo_76346291/id_14677278/opt_/fpt_/c_360/

Physics of Catapults

- Some catapults work because of some stored tension
- In a rope, bent wood, or possibly rubber bands

- Trebuchets
- Counterweighing

Physics of Catapults

- Ideal launch angle?
- 45°
- Think of the flight of a baseball home run, or football kickoff

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