Catapult Engineering & Design Grade 7 Pollard 2012.

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Presentation transcript:

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

Gravity

What uses gravity to launch the projectile?

TREBUCHET

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

Pivot

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