What is Catapult: Definition and 91 Discussions

A catapult is a ballistic device used to launch a projectile a great distance without the aid of gunpowder or other propellants – particularly various types of ancient and medieval siege engines. A catapult uses the sudden release of stored potential energy to propel its payload. Most convert tension or torsion energy that was more slowly and manually built up within the device before release, via springs, bows, twisted rope, elastic, or any of numerous other materials and mechanisms.
In use since ancient times, the catapult has proven to be one of the most persistently effective mechanisms in warfare. In modern times the term can apply to devices ranging from a simple hand-held implement (also called a "slingshot") to a mechanism for launching aircraft from a ship.
The earliest catapults date to at least the 4th century BC with the advent of the mangonel in ancient China, a type of traction trebuchet and catapult. Early uses were also attributed to Ajatashatru of Magadha in his war against the Licchavis. Greek catapults were invented in the early 4th century BC, being attested by Diodorus Siculus as part of the equipment of a Greek army in 399 BC, and subsequently used at the siege of Motya in 397 BC.

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  1. L

    Energy efficiency of torsion Catapult

    Homework Statement How would you find the energy efficiency of a torsion catapult ? (one i built for project) I have the Force at which I am pulling the arm. F = 20N also the angle from origin to the point of release ( or when the ball leaves the arm) Theta = 50 degrees...
  2. P

    Help in calculating efficiency of a catapult

    Help with a catapult Homework Statement Hi all I have design a prac to investigate the efficiency of a catapult, was wondering if anyone could shed some light into this area Homework Equations Ee=0.5kx^2 (hookes law) The Attempt at a Solution I was thinking that my independent...
  3. T

    Catapult Question: Force of Friction & Kinetic Energy

    The strain energy of a catapult extended by 1metre is 20J. When x=1m, A 1kg block is catapulted a distance of 2.5metres from the point of release along a horizontal floor. a. What is the magnitude of the force of friction between the block and the floor? b. What is the maximum kintetic...
  4. R

    Designing an Egg-Firing Catapult for Physics Expo

    Im not sure if this is the right section to post this but if it isnt, feel free to move it! :) My physics class is going to south dakota state university's physics and engineering expo and we all have to enter in at least one of the competitions, my friend and I have entered in a competition...
  5. A

    Jet Catapult Work: Calculate Kinetic Energy & Work Done

    Homework Statement A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam powered catapult. The thrust of its engines is 2.3x10^5 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.5x10^7 at lift off. What is...
  6. E

    How does mass affect the launch of a catapult and the projectile flight?

    How does mass affect the launch of a catapult and the projectile flight?? Homework Statement How does the mass of the projectile affect the projectile as it is being lauched and after it is launched? Could your catapult launch a tennis ball and a boulder equally well? Once in flight...
  7. R

    How Does a Catapult Calculate Force and Initial Velocity for a Projectile?

    Please,I need help with this problem... You are launching a 200kg projectile over the castle wall and trying to hit the keep. If the catapult holds the projectile for 2 seconds before releasing what is the average force delievered by the catapult? The keep itself is located 75 meters...
  8. B

    Designing a Catapult: Calculating Mass Moment of Inertia & Launch Speed

    This is a catapult design project. Homework Statement The counterweight is 400lb, the boulder (projectile) is 50lb and the throwing arm is 100lb. The throwing arm is assumed to be rigid, uniform in density, and weight. The throwing arm is also 17ft in total length. The throwing arm starts...
  9. H

    Calculating the torque in a moving arm of a catapult

    Find the ideal energy transferred to a projectile in a spring launching device, the device is a catapult which involves a bungee cord being stretched and has the cord attached to a throwarm which is pivoting on a circular rod. i have calculated the elastic energy stored in the cord at the...
  10. C

    Build a Catapult to Shoot a Ball 2m into a Bucket

    we were given a project in physics where you build a catapult that shoots a tennis ball 2, 4, or 6m. Now i have a basic design that I am not sure if it will shoot 2m. all i need is the ball to be able to shoot 2m into a 5 gallon bucket. here is the design i am loooking at...
  11. D

    Catapult Projectile Question wow

    Homework Statement Catapult A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H = 35.0 m above sea level, directed at an angle theta = 48.7° above the horizontal, and with a speed v = 26.1 m/s. Assuming that air...
  12. M

    Torsion Spring Catapult Velocity

    I'm trying to design a simple torsion spring catapult to launch a 0.15kg ball at a velocity of 35 m/sec at the moment of separation. The ball will be in direct contact with the unrestrained end of the spring. As a starting point, I'm planning a 0.3m length for that "arm" end of the spring as...
  13. C

    Steam catapult and rotating runway for airports

    What do people think about this 1. Put steam catapults on all airport runways (or perhaps use Linear Induction Motors) 2. Get the plane to accelerate all the way from the gate following a track, through to launch, so acceleration for take off starts from 'go'. Apply an acceleration...
  14. S

    Catapult Experiment: Building and Calculating Launch Distance with Bungee Cords

    The culminating task for my physics course was to build a catapult that can launch a ball bearing 2-7m. I built the catapult out of wood and its on a pivot and I'm using a bungee cord to make it snap back when its pulled back. How to I develop a formula to calculate prior to launch how far...
  15. T

    Designing an Onager Catapult: Tips and Tricks for Optimal Performance

    Hi! I'm making a onager for a project and so far I'm not having much luck! My Onager has to fit inside a 0.5m x 0.5m x 0.5m cube, and it will be throwing tennis balls. I've been browsing around a few nights already and found this topic, which has helped me the most by far...
  16. C

    What is the work done on the jet by the catapult?

    A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.20 * 10^5 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.00 *10^7 J at lift-off. What is the work done...
  17. 1

    Catapult Projectile Range: Calculate w/Varied Mass

    a catapult that shoots at 45 degrees, with counterweight on one side. the catapult is similar to a see-saw, where projectile is placed on one end, and the counterweight to another end. the counterweight is lifted to a 45degrees and released. is there any way to find the theoretical range of...
  18. K

    Work done on the jet by the catapult

    Homework Statement A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 3.14 x 10^5 N. In being launched from rest it moves through a distance of 85.1 m and has a kinetic energy of 5.63 x 10^7 J at...
  19. J

    SUPER ULTRA MEGA CATAPULT [no joke]

    Homework Statement Hello!, Beforehand i want to thank you for taking your time to look at this. Here's the deal: There's a contest in my school for Science Fair. We have to make a catapult and throw tennis balls as projectiles. Here are the rules: 1) The catapult max measurements have to...
  20. A

    Exploring the Mechanics of a Torsion Catapult Skein

    Is anyone familiar with a rope skein like on a torsion catapult? Essentially there are two points between which a great length of rope is wound. The base of an arm is placed in the center of this oblong before both of the fixed points are twisted in the same direction. This process forces the...
  21. N

    :Launching a Jet: Understand the Physics of a Catapult

    An aircraft carriers capapult accelerates a 2000-kg jet aircraft from rst to a lauch speed of 320m/s in 2.0s. a) The net force on the plane is ? b) the length of the catapult is ? F= m/a Lenght= at^2/2 vf=vo*at 320m/s= (0) * a * 2.0s a= 160 m/s F= 2000kg *...
  22. J

    Calculating Height of a Pebbled Launched by a Catapult

    Homework Statement You shoot a 57 g pebble straight up with a catapult whose spring constant is 310 N/m. The catapult is initially stretched by 0.30 m. How high above the starting point does the pebble fly? Ignore air resistance. _____ m Homework Equations ? The Attempt at a...
  23. I

    Electric Catapult Aircraft: Fuel Savings & Noise Reduction

    Aircraft carriers have been catapulting off aircraft for many years now, so that technology is not strange. At the same time, magnetic propulsion is becoming more and more common for various purposes. So why are these two technologies not combined for commercial aircraft? Imagine a rail track...
  24. D

    Rock Launching from a catapult - 2D Kinematics

    Homework Statement A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 33.0 m above sea level, directed at an angle θ above the horizontal with an unknown speed v0 The projectile remains in flight for...
  25. L

    How can i find the efficiency of a trebuchet and/or catapult

    I'm doing something for a science fair experiment and I'm trying to compare a catapult to a trebuchet. i will be comparing range, accuracy, and efficiency. But i don't know the equation to find efficiency of each siege wepaon. both of these medieval wepaons will be tabletop size som they won't...
  26. F

    What is the length of the catapult?

    Homework Statement A Jet fighter plane is launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0s. Assuming the acceleration is constant, what is the length of the catapult? Am I looking at this correctly...
  27. F

    Solving Catapult Physics Homework with Simple Mechanics Equations

    Homework Statement How simple mechanics equations can be used to describe force, acceleration, speed, distance, etc. of a catapult. Homework Equations This is my question. I have the time and distance traveled already, I'm hoping for some help as to what formulas to use. I don't...
  28. B

    Calculating Launch Angle of Rock from Catapult on a Cliff

    Homework Statement A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 32.0 m above sea level, directed at an angle q above the horizontal with an unknown speed v0...
  29. Tsu

    Funny Squirrel Catapult | ROFL Moment

    Too funny...:smile: :smile: :smile:
  30. Z

    Construction of the Roman Onager (catapult)

    Hi, me and a friend of mine decided to construct a Roman Onager for school. This is because of some kind of (practical) exam every student has to undertake here in the Netherlands. For example.. some people study the effects of alcohol on the human body and others build a rocket and try to...
  31. 7

    How to control an angle of a catapult

    hi everyone.. this is my first post :smile: im investigating a catapult i would like to know how to control an angle of a catapult to get maximum distance ? thanks ..
  32. I

    Which Catapult would work best?

    I'm not sure if I posted this in the right thread, if not feel free to move it. I have been assigned to build a catapult as my physics project. I have researched a bit and saw some examples. The main purpose of the catapult will be accuracy. First of all, I wanted to ask you experts which...
  33. C

    How do I Calculat on distance in Catapult project

    I'm doing a Assignment is to conststruce a captapult that will launch a marshmallow(Large size) at target on the floor at the other end of the classroom. I designed catapult. the rules saing the energy;; to launch the marshmallow cannot come directly from the motion of a human being.so i used...
  34. M

    Build a Coin-Throwing Catapult in 2 Weeks

    I need to make a catapult in less than 2 weeks... it has to be able to throw a 5 cent coin (aust coin) on exactly 2 metres... its not much but i can't figure out what design I'm going to make, since i need to be able to do calculations beforehand and make the catapult using my calcs... so now i...
  35. M

    What is the Physics Behind a See Saw Catapult?

    I posted this on the k-12 forum but i haven't been getting any responses. At first glance the physics of a seesaw seem quite simple, however I've been stumped on a problem. For part of my Physics project, I am incorporating a seesaw catapult where one weight will be dropped on one side...
  36. M

    .Solving the Physics of a Seesaw Catapult

    At first glance the physics of a seesaw seem quite simple, however I've been stumped on a problem. For part of my Physics project, I am incorporating a seesaw catapult where one weight will be dropped on one side launching the hacky sack on the other side. Simple right? Of course... but the...
  37. M

    How to improve the mechanical advantage of a catapult

    I have a catapult that is a class 1 lever i.e. a rubber band pulls down on the beem on one side of the fulcrum; the load is launched from the end of the beem on the other side of the fulcrum. I want to increase the throwing distance of the catapult. I recognize that one option is to increase...
  38. A

    Determining arm length of catapult

    Hi, I have a big problem... I got a project on building a catapult. Easy, right? WRONG! We are supposed to determine the arm length without trial and error and I have no clue what to do. Please please help! Catapult is supposed to be built with 3/4" paper clamp as the only energy source and...
  39. B

    Calculate Angle & Speed of Rock Launched from Cliff Catapult

    A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 34.0m above sea level, directed at an angle above the horizontal with an unknown speed. The projectile remains in flight for 6.00 seconds and travels a horizontal...
  40. M

    HELP need info on physics of a catapult

    im doing my a-level coursework on the physics of a fishing catapult if anyon has any useful information it would be greatly appreciated
  41. M

    Gravitational catapult and a spacecraft

    Hello. "Another notable thing is that Pioneer 10 used the gravitational catapulting effect of Jupiter. That was the first time that was ever done for interplanetary light. Pioneer 11 followed in its footsteps about seven years later to go out of the solar system." That text was taken from...
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