Science Flashcards
(29 cards)
What are the nine different types of energy?
Nuclear Heat Light Sound Electrical Chemical Kinetic Gravitational potential Elastic potential.
Where does nuclear energy come from?
The energy comes from changes from the nucleus of an atom.
What does the conservation of energy state?
It states that the total amount of energy remains constant.
How to describe the energy transfer for a phone?
The battery contains chemical energy which transfers electrical energy into the phone powering it and also transferring light energy.
What is meant by the term closed system?
Closed system is a physical system that does not allow certain types of mass and energy transfers in or out of the system.
What is an example of a closed system?
An example of closed system would be a thermos.
What is the equation for work done?
Force times distance.
What is an independent variable?
A variable that you choose to change.
What is work done measured in?
Joules (J)
What is the energy transfer for a bungee jumper?
The energy is transferred from the gravitational potential energy store to the kinetic energy store as the jumper accelerates.
What is force measured in?
Newtons (N)
What is a control variable?
A control variable is a variable that you keep the same.
What is Hooke’s Law?
A law that the strain in a solid proportion to apply stress within the elastic limit of that solid.
Where does the UK mainly get their energy from?
UK uses coal, gas and uranium.
How is biofuel produced?
Biofuel is a fuel that is produced through things like anaerobic digestion.
What can biofuel be used for?
Biofuel can be used for transportation, heat.
How does wind produce electricity?
Wind produces electricity by using a wind turbine that’s connected to a generator.
How do you work out kinetic energy?
0.5 times mass times (speed)2
How does a solar panel work?
Solar panels work by allowing light particles to knock electrons from atoms and that generates a flow of electricity.
What are the names of the poles of a magnet?
The Names of the poles would be north and south.
What are some magnetic metals?
Iron, nickel and cobalt.
What is the effect of increasing the current on the magnetic field around a wire?
The effect is that the current increasing would make the magnetic field more powerful around the wire.
How do you turn a magnet into an electromagnet?
Use a pair of wire strippers to remove a few centimeters of insulation from each end of the wire. Neatly wrap the wire around the nail. The more wire you wrap around the nail, the stronger your electromagnet will be. Make certain that you leave enough of the wire unwound so that you can attach the battery.
How do you demagnetise a magnet?
You can demagnetise a magnet by heating or hammering the magnet.
