The purpose of this lab was to figure out how much energy and weight from the dart was needed to puncture the plastic film, or causing it to fail. Molecularly, the lab was testing to see if there was enough weight to break the bonds that make up the plastic film. Physically, if the energy and weight was powerful enough, then this would create a hole in the plastic film upon contact with the dart. The critical parts of this machine were the “O” ring and the weights. During this lab it was important the the “O” ring was functioning properly. This meaning that the “O” ring could hold the plastic film taut in order to accurately determine how much energy was needed to tear the film. Also, the weights were important because the weights were crucial …show more content…
materials needed in order to run the Dart Drop Impact Test. Methods and Materials: Materials: Paper cutter 20 samples of plastic film (17 cm x 17 cm) Dart Weights Tester Methods: First, 20 samples of plastic film, each 17 cm by 17 cm, were cut. More samples were cut throughout the lab when needed. Next, one sample was put into the “O” ring and held in place using a clamp. The 300 g weight was used first and was slid onto the dart head. The dart head was locked into place by pushing it up into the tester at the top. The release mechanism allowed the dart to drop and test the plastic film sample. A tear in the plastic film indicated a “failure” and if the dart did not puncture the plastic film then that was considered a “non-failure”. For the next sample, the same steps took place, except 20 g of weight was taken off in the case of a “failure” and 20 g was added in the case of a “non-failure”. The testing could not end until N=10, or in other words there were 10 total failures. All of this data was organized in a chart which will be discussed in the “Data/Results” section. Data/Results: These were the materials used in the lab, which include dart drop impact mechanism, dart with weights and 20 samples of LDPE film shown in Figures 1-2.
Theses photos exhibit the process taken to test the amount of energy required for the plastic to fail due to the impact of a free falling dart, as well as, the results of a fail and success. A fail happens when the amount of energy applied was strong enough that the plastic is broken. A success is when there is not enough energy to break the plastic. The process of testing the amount of energy required to for the plastic to fail due to the impact of a free falling dart was tested 35 times in order to gather a total of 10 failures. The data was gathered in a chart shown below in Figure 6. Ni on the graph represents the number of failures and i is equal to 0 for the lowest dart weight failure; once 0 has been enters the value increases by 1 as weight increases. The sum on ni and i are represented in the ini column. From this graph addition data was able to be collected: N= sum of all the ni = 10 A= sum of all the ini = 79 Wo = the missile weight where i is equal to zero = 340 grams ΔW= 20 grams *kept consistent throughout the whole
lab Wf= Wo+[ΔW(A/N-1/2)]= 340g+[20g(79/10-½)]=488g Errors/Variables: The most prominent error throughout the lab was the aged rubber seals on the ‘O’ ring clamp were not sufficiently holding the film taught. Several times when the dart hit the plastic film, it would give a little bit. The results we skewed since it varied when the plastic film would give when the dart came in contact with it. This was an uncontrollable variable because the ‘O’ ring clamp’s malfunction was unpreventable. If the rubber seals were replaced this error could have been avoided. In addition, in order to get better results the LDPE film was replaced with Trader Joe’s Arugula plastic packaging. Next, although the weight itself was a controlled factor, the arrangement of the weights placed on the dart could have slightly affected it’s falling path. The weight distribution on the dart could have affected the dart’s orientation in the air, which in turn affects the air resistance on the dart. This varied with each drop since the weight’s arrangements were altered with each drop. Conclusion and Discussion: This lab concluded that it takes an average of 488 grams to break the film using the dart. The lab showed how strong of an impact the LDPE plastic film can take in a packaging environment. In the test, the energy is expressed in terms of the weigh in grams of the dart falling from a specified height resulting in 50% failure of the specimens which are being tested. In this specific lab, it resulted in 35% failure rather than the 50% that was provided in the ASTM testing. There was a large range of weight that was used from 300-620. The only time that a failure occurred with the same weight was at 520. Products used with LDPE film include salad bags and other bags that hold food. Possible reasons that the data fluctuated could be due to the film not being clamped down the same way each time.
Now what I will need for this experiment is two aluminum bats, they don’t need to be the same exact bat, but they will be the same length and weight. I’ll need a few racquet balls and I will probably try it with bou...
Different collisions took place throughout the process of the Rube Goldberg Machine. This included Elastic and Inelastic collisions. An example of an Elastic Collision in our Rube Goldberg Machine is when the car went down the track and collided with another car. Elastic collisions are defined as collisions with conservation or no loss of momentum. This is proven by the first car which transferred its momentum to the second car thus momentum was perfectly conserved. An Inelastic Collision is seen in our project ...
First we will examine the primary factors involved with projectile motion in an ideal situation, where no air resistance is involved.
In order to find out that a particular weapon is responsible for the damage caused, then simulation experiments may be required. If a weapon is given, then simulation stab-cut, slashes should be examined in test clothing and the characteristics created is compared to the ‘crime scene’ damage.
I believe that the purpose of doing this is to allow me to demonstrate my understanding of Elastic potential energy. And the projectile concepts of the effect of changing potential into kinetic energy and for me to demonstrate my ability to apply elastic potential energy to a scientific investigation.
The purpose of the projectile lab is to test the validity of the law of conservation of energy. The application of this law to our everyday lives is a surprisingly complicated process. Conservation of energy states that energy cannot be created or destroyed, but that it can be transferred from one form to another. Consider the projectile lab from document A that this essay is based upon. In an ideal experiment, the projectile is isolated from everything except the gravitational field. In this case, the only force acting on the particle is gravity and there are only two forms of energy that are of interest: the energy of the particle due to its motion (defined as kinetic
The mangonel catapult was the most well known one. The way this catapult functioned was by pulling back on a wooden stick that was connected to a wooden arm with a bucket, would pull that arm back. Pulling back on the wooden stick would cause the potential energy of the catapult to be stored in the torsion of the ropes of the wooden arm. When the wooden stick was let go the arm wood immediately return to its original position of 90 degrees where a wooden block would stop its impact and would then launch the projectile. When the arm reaches back to its original position it forms an arc with a radius equal to the arm length. Therefore the potential energy is transferred into rotational kinetic energy. Decreasing the torsion in the ropes of the wooden arm would make the projectile travel at a slower velocity. To calculate the t...
Television has affected every aspect of life in society, radically changing the way individuals live and interact with the world. However, change is not always for the better, especially the influence of television on political campaigns towards presidency. Since the 1960s, presidential elections in the United States were greatly impacted by television, yet the impact has not been positive. Television allowed the public to have more access to information and gained reassurance to which candidate they chose to vote for. However, the media failed to recognize the importance of elections. Candidates became image based rather than issue based using a “celebrity system” to concern the public with subjects regarding debates (Hart and Trice). Due to “hyperfamiliarity” television turned numerous people away from being interested in debates between candidates (Hart and Trice). Although television had the ability to reach a greater number of people than it did before the Nixon/Kennedy debate, it shortened the attention span of the public, which made the overall process of elections unfair, due to the emphasis on image rather than issue.
...ect for the 1kg and 1.5kg weights as the momentum before the collision did not equal to the momentum after the collision. This is because of experimental error that prevented the experiment from being an isolated system and thus the Law of Conservation of Momentum could not be executed.
A firearm, in the most basic form, consists of a barrel, an action, a firing mechanism, a stock and a sighting device. No matter the form of the firearm, the same basic principles of physics and chemistry apply. The study of these principles is called ballistics. There are three types of ballistics, internal, external, and terminal. Internal ballistics is the study of the flight of a projectile inside a firearm. External ballistics is the study of the flight of a bullet after leaving the muzzle and until it hits the target. Terminal ballistics is the study of the effects of a projectile on a given target. Because this essay deals with the flight of the bullet, terminal ballistics will not be discussed.
deal of energy is required, most of which appeared as heat in the target. As a
• The experimental equipment is set to output 1000 points of displacement and side force. The computer capture rate is set to 50Hz and a total run time of 20sec
...e could add the mass piece without having them fall off. At the time of the experiment, this was not seen as a threat to our results.
In this term paper, I will be relating projectile motion to personal experiences, movies, TV show, and Previous knowledge.
In this assessment of the projectile motion of an object, I found that it can be applied to many useful situations in our daily lives. There are many different equations and theorems to apply to an object in motion to either find the path of motion, the displacement, velocity, acceleration, and time of the object in the air.