1. TREBUCHET Report Grading

2. Trebuchet The report will included the following information: (1) a word processed document, size 12 font, doubled spaced, (2) a very brief history on the trebuchet, (3) Physics based principles on how and why the trebuchet operates, (4) description on how the team designed, collected, assembled, and tested their trebuchet, (5) show calculations on computing trebuchet force, (6) data table showing team test results, (7) information on how much money is used in the building of the trebuchet, (8) correct writing method and procedures used in the report, (9) bibliography and internet sources listed.

3. Trebuchet Typed report – 20pts Brief history – 20pts Physics based principles – 20pts Physics calculation – 20pts Design & assembly – 10pts Blue prints / pictures – 10pts Data Table (test) – 50pts Cost of project – 10pts Bill of Material – 10pts Correct writing – 20pts Bibliography – 10pts Possible 200 points

4. Trebuchet Bill of Material looks like this Trebuchet 6 @ 2” x 4” x 8’0” $3.25 = 19.50 2 @ 2” x 10” x 10’0” $ 9.00 = 18.00 1 @ 1” dia. X 4’0” $2.00 = 2.00 1 @ 4” x 4” x 8’0” $ 8.00 = 8.00 1 @ ¾” dia. x 25’0” rope $6.00 = 6.00 3 @ Screw eyes 5/8” x 2”.75 = 2.25 1 @ Bolt ½ x 6” 1.25 = 1.25 50 @ nails 3” 3.00 = 3.00 Total 60.00 Cost per team member 60.00/4 = 15.00

5. Trebuchet Calculations Counter weight / projectile mass Conversion lb x.453 = kilograms Distance feet to meters Conversion ft x.3048 = meters Gravity Metric = 9.8 m/sec 2 Gravity English = 32 ft/sec 2 Potential Energy – English E p = w x h Potential Energy – Metric E p = m x g x h Velocity = Distance / time Acceleration a = V f – V i / t Kinetic Energy – English E k = ½ w/g x v 2 Kinetic Energy – Metric E k = ½ m x v 2 Torque = F x L Work = T x Ɵ Mechanical Efficiency = Work out / Work in x %

6. Trebuchet Graph – should look like this.

7. Trebuchet throw Distance ft. Distance MReason 1154.57Lengthen sling 2175.18Lengthen sling 3185.49Lengthen sling 4257.62Lengthen sling 53711.28Bent nail 64012.19Changed sling 700.00New nail / Hook 84814.63More weight 95717.37More weight 106519.81More weight Data Table should look like

8. Bibliography http://www.trebuchet.com/ http://www.tbullock.com/trebuchet.html Gurstelle, William The Art of trebuchet, Chicago Review Press 2004