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  2. Slingshot - Wikipedia

    en.wikipedia.org/wiki/Slingshot

    A slingshot or catapult is a small hand-powered projectile weapon. The classic form consists of a Y-shaped frame, with two tubes or strips made from either a natural rubber or synthetic elastic material. These are attached to the upper two ends. The other ends of the strips lead back to a pouch that holds the projectile. One hand holds the ...

  3. Catapult - Wikipedia

    en.wikipedia.org/wiki/Catapult

    Basic diagram of an onager, a type of catapult. 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. [1] A catapult uses the sudden release of stored potential energy to propel its payload.

  4. Electromagnetic Aircraft Launch System - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_Aircraft...

    The EMALS uses a linear induction motor (LIM), which uses alternating current (AC) to generate magnetic fields that propel a carriage along a track to launch the aircraft. [5] [6] The EMALS consists of four main elements: [7] The linear induction motor consists of a row of stator coils with the same function as the circular stator coils in a conventional induction motor.

  5. Trebuchet - Wikipedia

    en.wikipedia.org/wiki/Trebuchet

    This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. Siege engine using long arm to throw projectiles For other uses, see Trebuchet (disambiguation). Replica counterweight trebuchets at Château de Castelnaud Counterweight trebuchet used in a siege from the Jami' al-tawarikh, c. 1306-18 A trebuchet [nb 1] is a type of catapult that uses a ...

  6. Elementary algebra - Wikipedia

    en.wikipedia.org/wiki/Elementary_algebra

    Unlike abstract algebra, elementary algebra is not concerned with algebraic structures outside the realm of real and complex numbers. It is typically taught to secondary school students and at introductory college level in the United States, [5] and builds on their understanding of arithmetic. The use of variables to denote quantities allows ...

  7. National Catapult Contest - Wikipedia

    en.wikipedia.org/wiki/National_catapult_contest

    The National Catapult Contest originated out of a simple directive from the Academic Development Committee of Indianapolis' Park School for Boys (now Park Tudor School) in December 1965, which "urged the faculty to review continuously the content and method of their instruction," and "further, not to forego unusual methods of stimulating the interest and involvement of students."

  8. Rocket sled launch - Wikipedia

    en.wikipedia.org/wiki/Rocket_sled_launch

    A rocket sled launch, also known as ground-based launch assist, catapult launch assist, and sky-ramp launch, is a proposed method for launching space vehicles. With this concept the launch vehicle is supported by an eastward pointing rail or maglev track that goes up the side of a mountain while an externally applied force is used to accelerate ...

  9. Crossbows and Catapults - Wikipedia

    en.wikipedia.org/wiki/Crossbows_and_Catapults

    Crossbows and Catapults, also known as Battlegrounds, is a game of physical skill first released in 1983.It has since been published by several different game publishers including Lakeside, Alga (), Base Toys, Tomy and currently Moose Toys (under the name Battlegrounds Crossbows and Catapults).