Energy Flashcards
What is kinetic energy?
Energy of a moving object.
What is energy?
The ability to do work.
What is potential energy?
Stored energy
What is chemical energy?
Form of potential energy, fuels, food, batteries
What is nuclear energy?
Energy stored in substances such uranium, plutonium, radiume
What is meant by elastic potential energy?
Stored energy when an object is stretched
What is gravitational potential energy?
Stored energy when an object is raised.
What are the type of waves that contain kinetic energy released by the sun?
Electromagnetic waves
Does sound travel through solids?
Yes, even faster than gasses.
Does sound travel through liquids?
Yes, slower than solids.
Does sound travel through gasses?
Yes, slower than liquids.
Does sound travel through a vacuum.
No
Would sound travel through solids faster than through liquids and gasses?
Yes because the particles are much closer together
Would sound travel at the same speed through a gas at different temperatures?
No because it travels through the colder particles faster because they are closer together
Which travels faster: light or sound?
Light
Why does light faster than sound?
Because you can always see something before you hear it.
Speed of sound: 330 metres per second
Speed of light: 300,000,000 metres per second
If a massive explosion occurred on the moon, would you see it, hear it, both or neither back on earth?
You would only see it. There’s no air in space.
In general, what type of material makes a good conductor of heat?
Metal
Which materials are poor conductors of heat?
Glass, wood, plastic
Are the abilities to conduct heat and light related?
Yes, because metals are good at conducting heat and energy.
Heat energy can move through substances using what three different methods?
Conduction, convection and radiation.
Heat always moves from hot to cold.
What is Conduction?
The process by which heat energy moves through solid materials.
How does conduction work?
Heat energy makes the particles vibrate. These particles make neighbouring particles vibrate so the heat energy is transferred throughout the material.
What is convection?
The process by which heat energy moves through liquids and gasses.
How does convection work?
As the gasses and liquids are heated, the particles move further apart and become less dense. This will rise through the cooler surrounding particles.
What is radiation.
The process by which heat energy moves through a vacuum (like in space) and between air particles.
Heat will travel in a straight line at high speed when traveling through space.
Heat always moves from higher_____to lower_____.
Temperature.
The state of matter that conduction occurs in.
Solids
The method by which heat is able to move liquids and gasses
Convection
When water is heated it moved in this direction
Upward
The movement of particles in a liquid or gas when being heated is called a convection_____.
Current
The process of heat transfer that moves between air
Radiation
Which colour cars would be better in hot climates
Light and shiny
Reflects well, absorbs poorly
Why do saucepans have plastic handles
So the heat will not be conducted through the handle
Plastic’s a good insulator
In colder climates, why is it useful to have insulation in the roof?
Insulation traps heat inside building because it’s a poor conductor
Why are circulation systems for swimming pools made of black plastic piping?
Absorbs heat from the sun
What is work?
Using energy to move something over a distance
What is renewable energy?
Energy that is easily replenished for example solar and wind energy
What is non-renewable energy?
Energy that are not easily replenished, for example, fossil fuels
What is a dependant variable?
A variable that is depends on another
The dependent you measure
On the Y axis
What is an independent variable?
A variable that doesn’t depend on another
The variable you change
On X axis
What is a controlled variable?
The variable you keep the same.
What is a hypothesis?
A sentience that states how the independent variable affects the dependent variable.
