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- Name 9 forms of energy.
(lesson 26a)
- Name 3 examples of stored
(potential) energy. (26a)
- Name 3 ways that
electricity is generated. (26a)
- What are the energy
transfers when a stone is fired from a catapult? (26a)
- What can you say about
the amount of energy before and after an energy transfer? (26a)
- What can you say about
the usefulness of the energy after an energy transfer? (26a)
- Where does most of the
Earth's energy come from? (26b)
- Name 3 fossil fuels.
(26b)
- Explain why fossil fuels
are non-renewable. (26b)
- Name some renewable
energy source. (26b)
- When an object is heated,
what happens to the atoms inside it? (26c)
- Why does a bath of
warm-water have more energy than a white-hot sparkler? (26c)
- Name 3 ways in which
energy can travel from a hot thing to a cold thing. (26c)
- Are metals conductors or
insulators? (26d)
- How does energy travel
from the Sun to the Earth? (26e)
ANSWERS
- Electrical, sound, light,
thermal (heat), kinetic, nuclear, chemical, gravitational, strain.
- Chemical energy,
gravitational energy, strain energy.
- Hydro-electric power to
turn a dynamo (generator); burning fuel (oil, coal or gas) to make steam to
turn a dynamo; using nuclear energy to make steam to turn a dynamo.
- Energy stored in your
body is transferred to: --> strain energy stored in the elastic, then
--> movement energy of the stone.
- It is the same (it is
'conserved').
- The energy spreads out to
more and more places and becomes less useful to us.
- The Sun.
- Coal, gas, oil.
- Because they took
millions of years to form, so once they are gone they are used up forever.
- Wind, waves, tidal,
geothermal, biomass, sun 9solar), hydro-electric (gravitational).
- The atoms vibrate. The
hotter it gets (higher temperature) the more the atoms vibrate.
- The bath has many more
atoms. So the total energy is bigger even though the atoms are not vibrating
much.
- Conduction, convection,
radiation.
- All metals are good
conductors.
- By radiation (solar
energy or radiant energy).
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