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Catapult Engineering & Design Grade 7 Pollard 2012
Design Challenge DESIGN & BUILD a Catapult that can launch a projectile at a target from a minimum distance of 10 feet
What is a CATAPULT? A machine used to throw or hurl a projectile great distances
What is a…. Projectile An object thrown into space by a force
Projectile Ping Pong Ball
CATAPULT in action
Specifications Can be NO larger than 10 ” long x 10 ” wide
Specifications Tower height can be NO taller than 10 inches
Specifications Throwing Arm can be NO longer than 12 inches long
Types of CATAPULTS
TREBUCHET? uses gravity & a seesaw effect to hurl its projectile
What is…. Gravity Force that cause 2 particles to pull towards each other
What uses gravity to launch the projectile?
BALLISTA? basically a crossbow fastened to a mount
Research How to build a Catapult
BUT before you begin…..
Things to keep in mind Pivot Short shaft on the end of which something rests & turns
Things to keep in mind Fulcrum pivot point on the arm
Fulcrum (Hole in the Arm)
Things to keep in mind Tension Stretching or straining
Tension (Elastic Bands when throwing arm is pulled back to launch projectile)
Things to keep in mind Compression To press together
Compression (Elastic Bands when throwing arm is released)
Things to keep in mind Newton ’ s Second Law of Motion
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
Newton ’ s Second Law of Motion? CATAPULT
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