Kinetic & Potential Energy
Everything that moves has _______ energy.
Kinetic
Mechanical energy is the sum of _______ and _______.
Mechanical energy is the sum of potential and kinetic energy.
Light energy can be _______ or _______.
Light energy can be natural or artificial.
What is a renewable energy source? Give five examples.
A renewable energy source is a source that cannot run out. Examples are sunlight, wind, water, biomass, and geothermal energy.
What are non-renewable energy sources?
Non-renewable energy sources are limited sources of energy that are almost impossible to replace.
What does kinetic energy come from?
It comes from motion.
What is mechanical energy used for?
It is used to do work.
Electrical energy can be converted into sound, light, heat, and movement.
Which is the cleanest renewable energy source on our planet? How do we use it?
Solar energy is the cleanest source of energy. We use solar panels for solar energy.
Where do fossil fuels come from? Give 3 examples of fossil fuels.
Fossil fuels come from organic materials that have been underground for millions of years. Examples are coal, crude oil, and natural gas.
What does an object's kinetic energy depend on?
It depends on its mass and speed.
What does thermal energy take the form of? Which objects have more thermal energy?
Thermal energy takes the form of heat. Warmer objects have more thermal energy.
What can we generate electricity from? Give five examples.
We can generate electricity from fossil fuels/nuclear power, sunlight, wind, water, and biomass.
_______ energy uses _______ _______ and is only effective in windy places.
Wind energy uses wind turbines and is only effective in windy places.
What radioactive mineral do nuclear power stations use? Is it renewable or non-renewable?
Nuclear power stations use uranium. It is non-renewable.
What is potential energy?
Potential energy is energy that is stored.
Our bodies use chemical reactions to change food into energy. What do we measure food energy in?
We measure it in calories.
What source produces sound energy? What are strong and weak vibrations?
Sound energy comes from a source that produces vibrations. Strong vibrations are loud sounds and weak vibrations are soft sounds.
Does water energy cause pollution? What is a negative effect of water energy?
Water energy does not cause any pollution, but wildlife habitats are destroyed when we build dams and there may be a loss of biodiversity.
What is a negative effect of nuclear power stations?
Nuclear power stations produce radioactive waste products which can cause cancer.
Potential energy can be changed into other forms. Explain how this happens with a tree.
The tree stores up potential energy in its wood. This energy is released when the wood is burned.
When is chemical energy released? Give an example.
Chemical energy is released during a chemical reaction. An example if the chemical reaction in batteries, which produce electricity.
What can sound travel through? What can't sound travel through? Give an example of something it cannot travel through.
Sound can travel through liquids and solids but it cannot travel through a vacuum. Sound cannot travel in outer space.
What is geothermal energy? What can be created from geothermal energy?
Geothermal energy is heat that comes from inside the Earth. Volcanoes and hot springs are created by geothermal energy.
What are positive and negative effects of coal, crude oil, and natural gas?