P3 Physics The Energy of Games and Theme Rides

Created by AP.

HideShow resource information
  • Created by: A.P
  • Created on: 21-01-13 19:38
View mindmap
  • The Energy of Games and Theme Rides
    • Gravitational Potential Energy
      • An object held about the ground has gravitational potential energy.
      • This is shows by the formula GPE = mgh, where m = mass, h = vertical height moved and m = gravitational field strength (10N/kg).
      • GPE is measured in Joules (J).
    • Energy Transfers
      • A bouncing ball converts GPE into kinetic energy and back to GPE. It does not return to its original height because energy is transferred.
      • When skydivers reach terminal speed, their kinetic energy (1.2mv2) has a maximum value and remains constant. The gravitational potential energy lost as they fall is used to do work against friction (air resistance).
        • When terminal speed is reached is can be shown as: Change in GPE = Work Done against Friction.
    • How a Roller Coaster Works
      • A roller coaster uses a motor to haul a train up in the air. The riders at the top of a roller coaster ride have a lot of gravitational potential energy.
        • When the train is released it converts GPE to kinetic energy as it falls. Loss of GPE = Gain in KE.
          • Ignoring Friction, as the train falls mgh = 1/2mv2.
            • h = (mv2)/(2mg) = (v2)/(2g). So this is independent of the mass of the falling object.
          • Each peak is lower than the one before because some energy is transferred to heat and sound due to friction and air resistance.
            • This is shown by the formula: GPE at top = KE at bottom + Energy Transferred (To Heat and Sound) Due to Friction.


No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Energy resources »