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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