Physics Flashcards
True or false: when a force moves an object through a distance, energy is created.
Why?
False
Because energy cannot be created or destroyed.
Name the 9 types of energy.
- Electrical
- Light
- Sound
- Kinetic
- Nuclear
- Thermal
- Gravitational potential
- Elastic potential
- Chemical
True or false: efficiency is the proportion of energy that is wasted.
False
What is the equation for calculating efficiency?
Useful energy out divided by total energy supplied times 10
True or false: Renewable energy sources will never run out
True
What type of energy do solar cells convert into electrical energy?
Light energy
Give one disadvantage of using geothermal energy.
You can only use it where hot rocks are near the surface, there are not many places to do it.
Will non-renewable energy sources ever run out?
Yes.
Give two advantages of using non-renewable energy sources.
- All of the fuels are fairly cheap.
- We can rely on them to provide us with electricity when we need it.
True or false: waves transfer energy.
True
What is frequency measured in?
hertz (Hz)
What is the amplitude of a wave?
The distance from the midpoint to the peak or trough.
What is the wave length of a wave?
The length of a full cycle of the wave.
How many types of electromagnetic wave are there? What are they?
7
- Radio waves
- Microwaves
- Infrared
- Visible light
- Ultraviolet
- Xrays
- Gamma rays
Give one use for radio waves.
Broadcasting TV and radio signals.
