Reducing Unwanted Energy Transfers

Question 1

What are the 2 main methods of reducing the amount of energy that’s wasted?

Answer 1

• Lubrication

- Thermal insulation

Question 2

What does decreasing the amount of wasted energy mean?

Answer 2

A higher proportion of supplied energy is transferred to useful stores, so efficiency of the process is increased

Question 3

What force acts against anything that moves?

Answer 3

Friction

Question 4

How does friction contribute to wasted energy?

Answer 4

Friction transfers energy mechanically to the thermal energy store, which is dissipated by heating to the surroundings

Question 5

In which situation would lubricants only be useful when reducing the amount of wasted energy?

Answer 5

If objects that touch each other are involved

Question 6

How do lubricants reduce the amount of energy wasted?

Answer 6

They’re used to reduce friction between objects when they’re moving, because they’re usually liquids (oil). The lubricants can flow easily and coat them