1. Catapult Engineering & Design Grade 7 Pollard 2012

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

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

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

5. Projectile Ping Pong Ball

6. CATAPULT in action

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

8. Specifications Tower height can be NO taller than 10 inches

9. Specifications Throwing Arm can be NO longer than 12 inches long

10. Types of CATAPULTS

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

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

13. Gravity

14. What uses gravity to launch the projectile?

15. TREBUCHET

16. BALLISTA? basically a crossbow fastened to a mount

17. Research How to build a Catapult

18. BUT before you begin…..

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

20. Pivot

21. Things to keep in mind Fulcrum pivot point on the arm

22. Fulcrum (Hole in the Arm)

23. Things to keep in mind Tension Stretching or straining

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

25. Things to keep in mind Compression To press together

26. Compression (Elastic Bands when throwing arm is released)

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

28. 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

29. Newton ’ s Second Law of Motion? CATAPULT