Upload
jonathan-whitcombe
View
75
Download
4
Embed Size (px)
Citation preview
[PHYSICS ASSIGNMENT] August 13, 2010
MorayfieldStateHigh School
Year 11 Physics, Semester 2 – 2010
Extended Experimental Investigation (EEI)
Forces &Motion – Trebuchet
Ayesha Berkett-Saleh
Teacher: Mr Forman
Start – 13/08/10
Finish – 00/09/10
Due Date – 13/09/10
[PHYSICS ASSIGNMENT] August 13, 2010
Contents
Title Page………………..…………………………………………………………………………………………………………….….Page 1
Contents Page………………………………………………………………………………………………………………………..…Page 2
Abstract………………………………………………………………………………………………………………………………….…Page 3
Introduction……………………………………………………………………………………………………………………………...Page 4
Method…….……………………………………………………………………………………………………………………………….Page 5
Results…………………………………………………………………………………………………………………………..………….Page 6
Analysis…………………………………………………………………………………………………………………………………..…Page 7
Discussion……………………………………………………………………………………………………………………….…..……Page 8
Conclusion……………………………………………………………………………………………………………………………..…Page 9
Appendix….……………………………………………………………………………………………………………..……………...Page 10
Bibliography and References…………………………………………………………………………………………………..Page 11
Acknowledgments…………………………………………………………………………………………………………………..Page 12
[PHYSICS ASSIGNMENT] August 13, 2010
Abstract
[PHYSICS ASSIGNMENT] August 13, 2010
Introduction
Motion plays a big part of our everyday life, but understanding the physics behind it is something more complex. The aim of this assignment is to throw an object as far as possible using a trebuchet. After analysis of the science of a trebuchet it was found that modifying the length of the arm, the trigger point and the counter weights are all variables that can optimise the performance of a trebuchet. This report will look at the physics of a trebuchet. It will show the building process and changes made along the way. From this process, it will achieve the greatest distance possible thrown.
[PHYSICS ASSIGNMENT] August 13, 2010
Background Information
Physics of a trebuchet
Work potential energy
Leavers
Formulas
That sheet with the writing on it and graph thing
[PHYSICS ASSIGNMENT] August 13, 2010
Method
What was used to build a trebuchet?
Job Section Part Description Qty Needed Type of Material Size (Length x width x thickness)
Base Long Rails 2 Pine
Short Rails 3 Pine
Skid Pan 1 Ply wood
Uprights Uprights 2 Ply
Ply Reinforcing 2 Ply wood
Braces
Axel 1
Launching Arm Middle Arm 2
Outer Arm 2
Miscellaneous String 1
Cloth 1
Projectiles 1
Counterweight 1
Screws 1
Nails 1
Hook 1
Wire 1
Saw 1
Drill 1
[PHYSICS ASSIGNMENT] August 13, 2010
Manufacture of the Trebuchet
Base
(picture)
The base is made up of 2 (measurements) Long Rails and 4 (measurements) Short Rails. It uses (something) joints to make the base more firm.
Uprights
(picture)
The uprights is 2 (measurements) vertical Braces to help support the 2 sheets of plywood which makes up the side.
Launching Arm
(picture)
The Launching arm is made up of 2 (measurement) Middle arms and 2(measurements) outer arms. Multiple holes are drilled into the launching arm to change the length of the arm, and to see what length will throw the best distance. Metal bolt to
Counterweight
(picture)
The counterweight weighs about (weight)
FINAL PICTURE
Modifications
Variable to be changed talk about changes say what stays the sames
Modification and more
[PHYSICS ASSIGNMENT] August 13, 2010
Results
Table of values
modification 1 distance, what was changed.
Values that are kept the same
Distance travelled vs arm length (graph)
Distance vs counterweight
Distance vs trigger point (string thing)
Any problems
ENERGY TRANSFERRED BETWEEN WEIGHT AND OBJECT
[PHYSICS ASSIGNMENT] August 13, 2010
Analysis
WHAT HAD THE BIGGEST EFFECT
What is the best outcome
What happens when you put all the best things together
[PHYSICS ASSIGNMENT] August 13, 2010
Conclusion
It was found that the trebuchet with a weight of ( ) arm length of () and lifting a (object). Possible improvements. Refer back to the data. Comment about the optimum design. WAS THERE SOMETHING ELSE
[PHYSICS ASSIGNMENT] August 13, 2010
Appendix
[PHYSICS ASSIGNMENT] August 13, 2010
Bibliography and References
[PHYSICS ASSIGNMENT] August 13, 2010
Acknowledgments