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6. Name and describe the four energy pathways/carriers

  • Mechanical-light Electrical-force Heat-current Radiation-force
  • Mechanical-work done by a force, Electrical-work done by a current, Heat-temperature change, Radiation-light eg infrared
  • Mechanical-current Electrical-force Heat-light Radiation-Temperature change
  • Mechanical-force Electrical-light Heat-current Radiation-current

7. Conservation of energy

  • Energy can be wasted, changed or transferred
  • It can be transferred usefully, stored or dissipated, but can't be destroyed
  • Energy can be changed, dissipated or destroyed
  • Energy can be wasted, transferred usefully or dissipated

8. What causes a thermal energy transfer build up?

  • Air resistance
  • Surface area
  • Friction
  • Gravity

9. Wasteful energy is...

  • Not usefully transferred
  • Wasted to the surroundings
  • Transferred to another store
  • Stored

10. What is a system?

  • A group of objects
  • An object and group of objects
  • An object or group of objects
  • An object

11. Elastic potential energy formula

  • 0.5 x spring constant x extension^2
  • 0.5 x extension x height
  • 0.5 x spring constant x extension

12. If the rate of transfer of heat energy is reduced, it is better at keeping thermal energy.This is achieved by:

  • higher conductivity in the walls, thicker walls
  • lower conductivity in the walls, thinner walls
  • poor conductors(low conductivity)in the walls, thicker walls
  • higher conductivity in the walls, thinner walls

13. Kinetic energy formula

  • 0.5 x mass x speed^2
  • 0.5 x strength x speed^3
  • 0.5 x speed x weight^2
  • 0.5 x mass x weight^3

14. What is a system change?

  • A change in energy pathway/carrier
  • A change in the way energy is stored
  • A change in energy
  • A change in energy transfer

15. Power definition

  • The strength of energy
  • The rate at which energy travels
  • The rate at which energy is transferred or the rate at which work is done
  • The speed of energy/rate at which energy is dissipated

16. Gravitational potential energy formula

  • mass x gravity x weight
  • mass x gravitational field strength x height
  • mass x gravity x base
  • mass x gravity x height

17. Useful energy is...

  • Wasted to the surroundings
  • Transferred where it is wanted in the form it is wanted in
  • Stored
  • Transferred to the surroundings

18. How do you reduce friction in moving parts?

  • Lubrication
  • You can't
  • Take it apart
  • Destroy it