Catapult Project
Expectations
Must fire 25-30 m
Must be able to hit the target
Must be consistent grouping
It must be a catapult, NO CROSSBOWS!!!
The power must come from a mechanical
force, no pneumatics
Target
25
22
19
16
0 –13
Target Setup
25 m
30 m
Two Possible Types
Traditional Catapult
Powered by an elastic force pulling forward
Trebuchet
Powered by a falling mass on the opposite
side of the throwing arm
Traditional Catapult
First models were powered by binding
rope
Possible power sources
Bungee cords
Springs
Other elastics
Arm is generally attached at end
Traditional Catapult Examples
Trebuchet
Powered by falling mass
Torque in = Torque out
Must decide arm lengths
Trebuchet Examples
Grading
Catapult (50%)
Accuracy (25%)
Distance (10%)
Construction (10%)
Consistency (5%)
Paper (15%)
Depth of Thought (5%)
Length (5%)
Presentation (5%)
Lab Report (25%)
Data Table (5%)
Calculation Table (5%)
Calculations (5%)
Results (5%)
Testing Procedure (5%)
Diagram (10%)
Detail of Design (5%)
Presentation (5%)
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