Reducing Unwanted Energy Transfers

Question 1

How does a house not lose heat energy?

Answer 1

1. Make sure the house is sealed closed so there is no loss of heat energy by convection
2. Have thick walls with low thermal conductivity with a cavity inside filled with insulating foam to reduce heat energy loss by conduction

Question 2

How to reduce friction?

Answer 2

1. Using lubricants like oil
2. Making vehicles more streamlined to reduce air resistance