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P1: Quiz 8
P1: Quiz 8
1) What is the law of conservation of energy?
2) What is the usual wasted energy store that energy is transferred to?
3) We can reduce unwanted energy transfer by lubricating moving parts.
a) Why would we want to lubricate moving parts?
b) Discuss how lubricating moving parts reduces unwanted energy transfer.
4)
a) Explain conduction.
b) What does the thermal conductivity of a material measure?
5)
a) Explain convection.
b) Does convection occur in the following states? Explain your answers.
i) Solid
ii) Liquid
iii) Gas
c) The diagram below shows a heater in a room.
2) What is the usual wasted energy store that energy is transferred to?
3) We can reduce unwanted energy transfer by lubricating moving parts.
a) Why would we want to lubricate moving parts?
b) Discuss how lubricating moving parts reduces unwanted energy transfer.
4)
a) Explain conduction.
b) What does the thermal conductivity of a material measure?
5)
a) Explain convection.
b) Does convection occur in the following states? Explain your answers.
i) Solid
ii) Liquid
iii) Gas
c) The diagram below shows a heater in a room.
Draw the convection current in the air produced by the heater.
6) Give 3 ways that households can reduce the amount of heat lost from their homes. Briefly explain what the ways are, how the ways reduce the amount of heat lost from a home and comment on the cost.
6) Give 3 ways that households can reduce the amount of heat lost from their homes. Briefly explain what the ways are, how the ways reduce the amount of heat lost from a home and comment on the cost.