reducing unwanted energy resourses

• when something moves, the frictional force against it causes energy in the system to be dissipated
• for objects moving together, lubricants such as oil are used to reduce friction
• you can prevent energy loss by heating using insulation and having thick walls with low thermal conductivity
• cavity wall insulation is where the cavity wall air gap is filled with foam reducing energy transfer
• double glazing reduces heat transfer through glass because there's an extra layer of air between them which has lower thermal conductivity than glass
• draught excluders around doors and windows reduce energy transfer by convectiom