Physics Project #2 Catapult
Basic structure of the catapult:
Note: the drawing is not drawn to skill.
Draw blueprint for the catapult. (See above)
Decide what kind of material to use for building the catapult.
Materials used for the parts of the catapult:
Arm ½ inch PVC pipe
Base and sides ½ inch PVC pipe
Rotation of the arm 2-inch hinge
Seat of the egg badminton ball
Joints / connectors ½ inch PVC joints (Tee and Elbow)
Others screws & rubber bands
Purchase all required materials
Quantity Length Totals
4 1 ft 4 ft
2 0.5 ft 1 ft
2 1.25 ft 2.5 ft
2 0.25 ft 0.5 ft
3 0.5 ft 1.5 ft
1 1.75 ft 1.75 ft
Total length of pipe needed: 11.25
Joints / Connectors:
Elbow Shaped 6
Tee Shaped 4
Rotation of the Arm:
2-inch hinge 1
Wide Rubber Bands 1 bag (from Wal-Mart)
Screws 1 & those required to attach the hinge
Put all the pieces together.
See diagram below for a detailed look:
Apply rubber bands.
For the best result and the most strength, the rubbers are looped.(Doubled) (See diagram.)
Use two strands of rubber bands and loop them with two other rubber bands.
(For a simpler understanding of how we use the rubber bands, the drawing above shows only one band looping the other. However, the actual design has two bands looping two other rubber bands. )
Place the seat for the egg.
Finally, our project is done!!!
Copyright © 1995 Mr. Lewis Classroom for Physics & Biology. All rights reserved.