Conservation of energy

Question 1

Explain what is meant by conservation of energy

Answer 1

energy can be stored and transferred between stores but it can neither be created nor destroyed

Question 2

List ways of preventing unwanted energy transfers

Answer 2

Thermal insulation : thermal radiation is reflected rather than absorbed.

Lubrication : A substance which reduces the effect of friction

Question 3

How is the rate if cooling affected by the thickness and thermal conductivity of its walls?

Answer 3

The thicker the wall, the slower the rate of energy transfer

Question 4

How can efficiency be increased?

Answer 4

Decreasing the amount of wasted energy means that a higher proportion of supplied energy is transferred to useful stores

Question 5

Name the main energy stores available for us on earth

Answer 5

1. fossil fuels
2. nuclear power
3. bio fuel
4. hydro electricity
   5.wind
5. 🌞

Question 6

Describe Fossil fuels

Answer 6

slowly running out
release CO2 when burned - global warming
non renewable

Question 7

Describe nuclear power

Answer 7

clean but nuclear waste is dangerous
difficult to dispose of

Question 8

Describe bio fuel + wind + sun

Answer 8

they’re renewable
will never run out
do not provide as much energy as they depend on weather

Question 9

Describe hydro electricity

Answer 9

renewable
generates power by using a dam
alter the natural flow of a river of other body of water