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Catapult Engineering & Design Grade 7 Pollard 2012

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Design Challenge DESIGN & BUILD a Catapult that can launch a projectile at a target from a minimum distance of 10 feet

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What is a CATAPULT? A machine used to throw or hurl a projectile great distances

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What is a…. Projectile An object thrown into space by a force

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Projectile Ping Pong Ball

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CATAPULT in action

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Specifications Can be NO larger than 10 ” long x 10 ” wide

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Specifications Tower height can be NO taller than 10 inches

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Specifications Throwing Arm can be NO longer than 12 inches long

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Types of CATAPULTS

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TREBUCHET? uses gravity & a seesaw effect to hurl its projectile

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What is…. Gravity Force that cause 2 particles to pull towards each other

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Gravity

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What uses gravity to launch the projectile?

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TREBUCHET

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BALLISTA? basically a crossbow fastened to a mount

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Research How to build a Catapult

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BUT before you begin…..

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Things to keep in mind Pivot Short shaft on the end of which something rests & turns

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Pivot

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Things to keep in mind Fulcrum pivot point on the arm

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Fulcrum (Hole in the Arm)

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Things to keep in mind Tension Stretching or straining

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Tension (Elastic Bands when throwing arm is pulled back to launch projectile)

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Things to keep in mind Compression To press together

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Compression (Elastic Bands when throwing arm is released)

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Things to keep in mind Newton ’ s Second Law of Motion

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Acceleration is produced when a force acts on a mass Newton ’ s Second Law of Motion The greater the mass (of the projectile) the greater the amount of force needed to accelerate the projectile

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Newton ’ s Second Law of Motion? CATAPULT

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