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%)