The Ratapult
Objective:
My objective in this project was to produce a rat-trap powered catapult. It has a base of 30 cm by 30 cm, and has a theme of cows trying to escape the farm. The reason they want to escape is because they are being killed and turned into steaks, against there will. That is why I developed this ratapult, to save the cows. The cows also wanted me to ask you to eat more chicken.
Hypothesis and Drawing:
I hypothesize that if I build the ratapult to a 25-degree angle, and release the hacky sack at a height of .55m then there will be enough velocity to project the hacky sack exactly four meters. The ratapult will release the hacky sack with an initial velocity of 5.8 m/s, and as a result the hacky sack will travel 4.0 meters in .75 seconds.
Procedure:
The first step I took was to paint all of the wood white. After that I put wallpaper on the board that I am going to nail the rat trap to. I then attached the measuring cup to the rat trap by drilling a hole in the middle of the measuring cup and then using string to attach the cup at both the drilled hole, and the hole at the bottom. Then I nailed the rat trap into the board with wallpaper. That board was then nailed into the base.
Then I attached the “steps” to the milk crate. The steps will hold the base of the ratapult at a 25-degree angle. I attached the “steps” by drilling holes in the bottom of them and then tying them to the milk crate. Then I nailed the board with wallpaper into the back end of the base. The base was then nailed into the “steps”, and glued grass decorations and cardboard cows to the base. The ratapult was completed.
Data & Observations:
I found the initial velocity, or Vi, by finding the horizontal velocity, or Vx, and then using the equation Vx = Vi * cos(angle).
The angle was 25 degrees, so I input that into the equation also. That made the equation look like
5.3 m/s = Vi * cos(25)
I divided both sides by sin(25), then that gave me an initial velocity of 5.8 m/s.
Then I decided to find the Vertical height of the hacky sack, so I used the equation
Vy = Vi * sin(angle). Vy stands for initial vertical velocity.
The velocity of the rock at any given point can be determined by adding it's translational velocity at the center of mass (the orange arrow) with it's rotational velocity.
For almost as long as civilizations began they have been fighting against each other. Often times these wars come down to who has the better military equipment. When one army creates an elite war machine another army is sure to soon copy or improve it. For example the U.S. Army Signal Corps purchased the first ever military aircraft in 1902 (Taylor). Two years later the Italians were also using aircrafts. The trebuchet catapult is no exception; it was one of the most destructive military machines of its time (Chevedden, 2000). A trebuchet works by using the energy of a falling counterweight to launch a projectile (Trebuchet). In this research paper I intend to explain the history and dynamics of a trebuchet catapult.
Carmichael, Ralph. "Numerical Procedure for Computing the Trajectory of a Baseball." 2003. 16 Nov. 2004 .
The Purpose of this lab is to use the impulse and momentum concepts to explain what happens when the eggs are dropped onto various objects.
speed of the ball rolling down a ramp. From the data that I'm going to
8. Tie an arm-length piece of string through each of the holes punched in the corners. Tie their open ends together.
So using this formula but with the data we collected from our first attempt, this is what it would look like; Tan(60°) x 23m = 39m. As you can tell this answer collected from our first attempt is very well incorrect, but at the time, our group did not know this.
With the arrival of fortifications such as forts, strongholds and gigantic walls to protect cities from hostile forces, conquering cities became so difficult and costly to do that every civilization must come up with an ingenious way to overcome this problem. Out of all methods ranging from complex engineering feats such as the siege tower to simple methods such as employing ladders, none are as well-known or as old as the catapult.
I am going to tell you about the planning and result of my egg drop project. First I took a green container and surrounded the outside with clear duct tape. Secondly I taped the inside which was very tricky. I then put bubble wrap in and taped the egg to it. I taped the top so the egg couldn’t fall out. I named the egg Aidan and have drawn a face on it.
Also, more incent topic in history of the catapult was believed to have opened in 12th century France with the inventions of the trebuchet. This huge train of siege is stated to have hit good fear in the hearts of the opponents. The project and this pure power have hurled this example catapult history through the history.
For our final project in physics we were assigned to create a moving car out of a mousetrap. In order to do that, the three of us had to work together and collect our thoughts to create a car that moves a certain length. We built a car using the following materials: mousetrap, 4 CDs, zip ties, BBQ skewers, straw, wire cutters, ruler, x-acto blade, scissors, cardboard, pencil and foam. Our first step in this experiment was deciding on what we needed to get and what we already had. Most of the list was stuff that we had in the classroom and we only needed to bring a few things from home. In the end we didn’t spend any money. We use a youtube video (https://www.youtube.com/watch?v=mVNFxlEMWvw&feature=youtu.be) as a refrence for building the
Wright, Tim. "How Things Work: Electromagnetic Catapults." Editorial. Air & Space Magazine Jan. 2007: n. pag. Airspacemag.com. Air & Space Smithsonian. Web. 10 Nov. 2013. .
A label was put on the curved surface of the flywheel. The mass was winded up again. 7. The height h of the mass was measured. The height h was recorded.
In doing this, let us consider that freely falling objects moves in a vertical direction that is, along the y-axis. instead of using Δx, we will use Δy.
Here, we can use the vectors to use the Pythagorean Theorem, a2 + b2 = c2, to find the speed and angle of the object, which was used in previous equations.