Reducing unwanted energy transfer

Air resistance

________ can transfer energy from a falling objects kinetic energy store to its thermal energy store.

Loft insulation

________ can reduce convection currents.

Draught excluders

________ around doors and windows to reduce energy transfers by convection.

Lubrication

________ reduces frictional forces.

Lubricants

________ are usually liquids (like oil), so they can flow easily between objects and coat them.

rate of energy

Insulation reduces the ________ transfer by heating.

low thermal conductivity

Having thicker walls with a________ are better for insulation.

cavity walls

________ are made up of an inner and outer wall with an air gap in the middle.

smaller

the thicker the wall, the________ the temperature change.

one frictional force against it

whenever something moves, there is at least________ .