Energy

Question 1

what are the 6 energy stores?

Answer 1

1) kinetic
2) gravitational potential
3) chemical potential
4) elastic potential
5) internal
6) nuclear

Question 2

what are the 4 ways of transferring energy?

Answer 2

1) mechanically (force acted over a distance)
2) electrically (by an electric current)
3) by heating (due to temperature difference)
4) by propagation of waves (EM or mechanical)

Question 3

when is no work done?

Answer 3

1) force acted on an object but it does not move
2) distance moved by object is perpendicular to direction of force

Question 4

when is work done?

Answer 4

applied force moves an object in a direction that is not perpendicular to the force

Question 5

what are 3 types of renewable energy and their advantages and disadvantages?

Answer 5

1) solar power
- highly efficient in the day with clear skies, no harmful gases produced when producing electricity
- very costly, unavailable at night/bad weather

2) hydropower
- highly efficient source of energy production, ~
- very costly, dams may harm ecosystems

3) wind power
- ~
- very costly, noise pollution, efficiency depends on wind direction and speed

Question 6

what are 2 types of non-renewable energy and their advantages and disadvantages?

Answer 6

1) nuclear power
- highly efficient source of energy, low carbon energy resource helping to reduce greenhouse gas emissions that cause global warming
- nuclear waste produced could contaminate water supplies in the environment

2) fossil fuels
- accessible, relatively cheap and easy to transport
- mining of fossil fuels disrupts ecosystems, burning causes air pollution and thus global warming