Energy Flashcards
Name 5 things that energy does?
- Energy makes things move and grow.
- It keeps our bodies warm.
- It makes TV’s work and helps to light up our homes.
- It helps us with our cooking and baking.
- It helps to transport people from home to work.
What is energy?
Energy cannot be seen,heard,touched or tasted but it makes things happen all around us. Without energy there would be no life,no movement,no light and no heat.
Think of 5 different ways that you use energy.
- Sport - athletics,tennis,cricket etc.
- Spinning a top.
- Talking.
- Walking.
- Jumping.
- Making breakfast.
- Riding in a car.
- Watching TV
Name 5 things that use energy with a different source and name the sources.
- Candle for light - wax
- Cooking with gas - gas
- Dad going to work in a taxi - petrol/diesel
- Catching a train - electricity
- Keeping warm next to the fire - wood
Name the two groups of energy sources.
Renewable and Non-renewable energy.
What does renewable energy mean?
It is an energy source which does not get used up which means we can go on using them forever.
What does non-renewable energy mean?
They are energy sources that cannot be replaced quickly or easily and can take millions of years to make.
Give some examples of renewable energy sources.
Water, wind,sun
What are the advantages of a renewable energy source?
- It will not run out
- It is free.
- It does not pollute the environment.
What are the disadvantages of a renewable energy source?
The machines that use renewable energy are expensive. It is not always reliable as sometimes:
The wind does not blow
Clouds block out the sun
There are no rivers or rain
Give some examples of non-renewable energy sources.
Gas,oil,coal,petrol and paraffin. These are called fossil fuels and take millions of years to make.
Give some advantages of non-renewable energy sources.
It does not cost as much.
Fossil fuels can be used whenever needed.
Give some disadvantages of non-renewable energy sources.
Once used you cannot get it back.
Fossil fuels are running out.
They cause pollution.
They cannot be recycled.
Name the forms of energy.
Potential energy and Kinetic energy.
What is the definition of potential energy?
Energy that is stored and has the ability to do work even at a later stage.
What is kinetic energy?
An object that is moving can do work. All moving things have kinetic energy.
Give 7 examples of potential energy.
Nothing
Give 2 examples of kinetic energy
- A flying rubber can work when it flattens a house of cards
- A swinging hammer does work on a nail
Energy we can see is called ………….. Energy?
Light
Give some examples of light energy.
Candles - the wax is the source
Coal/Wood fires
Paraffin gas lamps
Electricity - this may be generated by burning coal or using the energy from water.
Energy we can feel is ……………. Energy?
Heat
How does heat flow?
Heat flows from areas of higher temperature to areas of lower temperature.
Name a few sources of heat energy.
Electricity,gas,wood,coal,sun,paraffin.
What do you use to measure temperature?
A thermometer.
What is the unit of measurement for temperature in South Africa?
Degrees Celsius
What is a thermometer made of and how does it work?
Thermometers are made of glass and filled with a liquid which is either mercury or alcohol. When the liquid gets warmed it moves up the thermometer.
What is heat?
When molecules of any atoms get more energy in them than they had before, they move faster and that is called Heat. When the molecules move faster they hit against each other and bounce apart and they end up further away from each other than they were before.
In heat, where does the energy come from?
It can come from the sun, volcanoes, from friction, nuclear fusion or many other sources.
How does heat move between objects?
If two things are touching each other, heat will flow from the hotter one to the colder one unless they are the same temperature. The molecules of the hotter one will slow down and the molecules of the colder one will speed up until they are all moving at the same speed and the two things have the same temperature.
Give an example of how heat moves between two objects.
If you put an ice cube in your mouth, your mouth will get colder and the ice cube will melt.
Where is energy stored
In fuels
What is fuel
Fuel is anything that we can use later to do work for us
Where do people get their energy from and what do we use it for
From food, we use it to play sport and work
