Physics Revision

Physics Revision

Multiple Choice

What does dissipating energy mean?

• transfer of energy to useful energy store

• transfer of energy to the thermal store of the surroundings (wasted)

Multiple Select

Which store of energy is increases when energy is dissipated?

• Thermal store

• Kinetic Store

• Gravitational store

• Chemical store

Poll

How does a ball falling dissipate some of its energy before reaching the ground?

• It loses it electrically

• Mechanically through friction. By pushing air molecules out of the way

• Some of it is transferred as light

Open Ended

What does efficiency measure?

Multiple Select

Why is efficiency never 100%

• Some energy is dissipated as heat

• more energy is made than used

Fill in the Blank

A sankey diagram shows how efficient an appliance is

Open Ended

Houses lose a lot of energy when they are heated. Where in a house do you think the most heat energy is lost?

Multiple Select

Which of these methods can be used to reduce unwanted heat loss in a house?

• Double glazing

• Loft insulation

• Draught excluder

• Foil backed radiator