The best way to start an experiment is to ask a question. Our question is, “What is a trebuchet?” In answering this question, we will investigate nearly every aspect of a trebuchet, including but not limited to history, design, build, and theory. Our experiment was started with the help of a packet which contained much of this information, therefore the only thing that needed to be completed was the design and build, and the work that follows-testing, demonstrating, and reporting. From experience, the best way to build a kit is simplicity. We did not spend a lot of time designing, but rather using past ideas to base our design on. Our reason for this is that there has been hundreds of years since the creation of the trebuchet, and since it has been optimized, why try to “fix what isn’t broke?” As you can see in fig. 1, our initial design was extremely basic. Our build consisted of assembly, using the supplied supplies, testing, tweaking, and retesting. The main objective is to achieve consistency.
We used2 L brackets as the initial main uprights, and eventually added a long straight piece to each to increase pivot point height. We supported these uprights by using 2 short flat pieces connecting the base and uprights at a 45° angle. Our arm is the piece most of the work was focused on. We tried to maximize the weight on the weight side of the arm, while minimizing the weight on the basket side of the arm. This was done by adding multiple brackets and hardware on the weight side, and by using lightweight pieces on the basket side. The basket was used and tied into the end of the arm, and a metal rod is used to hold the loop of the basket to determine launch angle. The majority of our procedure was based on the effect of the trebuchet, and being able to correct any deficiencies.
The Review on An Archery Test Rig Made Using Computer Aided Design
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Analytical Procedure
A trebuchet works by converting stored potential energy into kinetic energy. It accomplishes this by establishing a gravitational potential energy, in the form of a weight which is raised off the ground, and transfers this energy through a pivot point, raising the arm of the trebuchet which has a velocity which is transferred into a ping pong ball which is released at some time. The stored energy, gravitational energy, is the most important to the trebuchet, and can be calculated with the formula; where the mass of the weight is, is the gravitational constant, and is the distance between the weight and the floor.
kinetic energy is the energy of motion. It can be found by using the formula; where is the initial velocity of the projectile and is the mass of the projectile. This formula is critical in maximizing the kinetic energy of the trebuchet, since the mass of the ball is fixed; the only way to affect the performance is to change the initial velocity. This initial velocity can be calculated by using the formula: , negating drag. After the experiment takes place, the efficiency of the trebuchet can be calculated, and since energy cannot be created or destroyed, this conservation of energy formula can be used: Unfortunately, the efficiency of this type of trebuchet is not very high, due to factors such as friction, and the transfer of energy into things other than the projectile.
Calculations and Results
Potential Energy: PEg=mwgh
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Energy Energy is the name given to the ability to do work. Work and energy are measured in the same units. People often confuse energy, power, and force. Force is a push or a pull on an object or body. The amount of work is determined by the strength of the force used and the distance through which it moves. Power measures the rate at which work is done. There are 2 different kinds of energy. ...
1.5kg9.81ms2.609m=8.95J
Kinetic Energy: KE=12mbv2
(12)(0.0025kg)(6.6 m/s)=0.05445J
Conservation of Energy: efficiency=E=KEprojectilePEgx100%
0.05445J8.95J=0.61J
Velocity: ∆xball=xf-xi=vot cos(θ)
7.25m=5.89ms1.23scos26.4°=6.6m/s
Discussion of Results and Conclusions
