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Science Test 1-II Review
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Why can't sound travel in space?
Because space is a vacuum, so sound does not have a medium to travel through.
Give an example of a natural light source.
Students' own answers.
Give an example of an artificial light source.
Students' own answers.
Give an example of a loud sound.
Students' own answers.
Give an example of a quiet sound.
Students' own answers.
Describe a situation that illustrates the law of conservation of energy.
Students' own answers
What is the law of conservation of energy?
Energy cannot be created or destroyed, but it can be transformed.
State the energy input and energy output
Light energy - Chemical energy
State the energy input and energy output
Chemical energy - Light/Sound energy
State the energy input and energy output
Electrical energy - Thermal energy
What are renewable energy sources?
They are energy sources that will never run out.
What are non-renewable energy sources?
They are energy sources that cannot be replaced once they have been used up.
Nuclear energy...renewable or non-renewable?
Non-renewable
Fossil fuels...renewable or non-renewable?
Non-renewable
Solar energy...renewable or non-renewable?
Renewable
Wind energy...renewable or non-renewable?
Renewable
Geothermal energy...renewable or non-renewable?
Renewable
Hydropower...renewable or non-renewable?
Renewable
Biomass...renewable or non-renewable?
Renewable
Dead plants and wood can be burned to produce steam for making electricity.
Biomass
Moving water can be used to spin turbines and generate electricity.
Hydropower
It is turned into electrical energy using solar panels.
Solar energy
Heat from inside the Earth can be used to generate electricity.
Geothermal energy
Oil, coal, and natural gas can be burned to produce electricity.
Fossil fuels
It is transformed into electricity using large wind turbines.
Wind energy
Uranium is turned into electricity in nuclear power stations.
Nuclear energy
It’s the sum of potential energy and kinetic energy that is used to do work.
Mechanical energy
It’s energy that is stored in an object because of its position or state.
Potential energy
It’s caused by a vibrating object that generates sound waves.
Sound energy
It’s created from the movement of atoms inside an object; the faster they move, the more heat is generated.
Thermal energy
It’s the energy generated because something is moving.
Kinetic energy
It’s caused by the movement of electrons (tiny particles in atoms) along a conductive material.
Electricity
It’s stored energy that holds atoms and molecules together. It can be found in food, petrol, and batteries.
Chemical energy
It’s produced by electromagnetic radiation. There are natural (the sun) and artificial (lamp) sources of this energy.
Light energy


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