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Physcoaster josh c
 

Physcoaster josh c

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AGAIN

AGAIN

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    Physcoaster josh c Physcoaster josh c Presentation Transcript

    • The Physics of Roller Coasters
      By Joshua Coyston
    • How roller coasters complete
      their circuits
      • ‘Gravity’ is said to be the reason why roller coasters complete their circuits, but this isn’t technically true.
      A lift hill moves the car / train up, increasing the gravitational potential energy (GPE). The car then gains kinetic energy as it loses gravitational potential energy. This conservation of energy explains why a standard roller coaster can never go higher than the height of its lift.
    • Launch Roller Coasters
      • Launch roller coasters are very different though; they have no form of lift to gain energy.
      • Hydraulic systems are most commonly used for launch roller coasters, as they provide a constant acceleration during the entire launch. They usually require 8 pumps of approx. 500 horsepower to launch.
      • Some roller coasters use LIM/LSM launch systems, which is where the train is propelled by electromagnets. This creates a very quick acceleration.
      Hydraulic Motor
    • Circular Motion
      • When roller coasters are being designed, safety is of upmost importance. When looking at aspects such as vertical loops and such, circular motion is most commonly taken into account.
      • V stands for Velocity
      • r is the radius of the circle.
      • T is the period of oscillation in the circle.
    • Circular Motion in Action
      • B is 3/8 of A. B = (23* 3/8) = 8.625
      • X is A-B = 23 – 8.625 = 14.375
      • Y, by chance, is also 14.375
      • Z =(X2+Y2) = [(14.375)2 + (14.375)2] = 20.329
      A=23m
      Z m
      So, d=20.329m  r=10.165m.
      Given that T5s:
      X m
      Y m
      V=(2*10.165)/5
      V=12.8 m/s or 28.6 mph (3sf)
      B m
    • The Clothoid Loop
      The Clothoid Loop, commonly known as ‘The loop-the-loop’ or a ‘Vertical Loop’, was first used on a roller coaster in 1975 and was designed by Werner Stengel. The main reason for this is because the circular loop causes much higher G-Forces on the body.
    • The Curious Case of Saw’s Differing Radii
      Red Line – How the track is.
      Green line – How the should be to prevent a ‘bump’.
    • Thanks for listening…