Drawing

DEPCOllc
800.767.1062 | www.depcollc.com | © 2013
3305 Airport Drive | Pittsburg, KS 66762
M1
Perimeter, Area and Volume Activity
Describing and Visualizing Totally Trebuchet Geometry
Activity #1 The Axle – Cross Section and Span
Sketch the GEARS trebuchet axle and label the dimensions on a separate sheet of paper. Remember
to include this sketch and all accompanying calculations and answers in your build report.
The trebuchet axle is a critical component;
supporting many times its own weight
across a span many times its diameter. It
also provides a low friction fulcrum for
the throwing arm assembly to turn on.
Throwing arm assembly
½ Weight of throwing
arm assembly supported
½ Weight of throwing
arm assembly supported
Axle
Span 3Ǝ (76.2 mm)
Axle Cross
Section
0.1875Ǝ (4.75mm)
Determine the following values:
1. The axle length (inches and centimeters)
2. Axle cross sectional area (in
2
and cm
2
)
3. Axle weight (pounds ounces and grams)
4. Span divided by the cross section diameter
5. Volume of the cylindrical axle. (in
3
and cm
3
)
Sample Math Curriculum