Physics Flashcards
For EOY Exams
Explain a magnetic store of energy
The energy stored when repelling poles have been pushed closer together or the other way round. Example: fridge magnets, compasses
Explain a thermal store of energy
The total kinetic and potential energy of the particles in an object, in most cases this is the vibrations. Example: Human bodies, hot coffees
Explain a chemical store of energy
The energy stored in chemical bonds, such as those between molecules. Example: Foods, muscles
Explain a kinetic store of energy
The energy of a moving object. Example: buses
Explain a electrostatic store of energy
The energy stored when repelling charges have been moved closer together or the other way round. Example: Thunderclouds
Explain a elastic potential store of energy
The energy stored when an object is stretched or squashed. Example: inflated balloons
Explain a gravitational potential store of energy
The energy of an object at height. Examples: mugs on a table
Explain a nuclear store of energy
The energy stored in the nucleus of an atom. Examples: nuclear reactors
What is mechanical work?
A force moving an object through a distance.
What is electrical work?
charges moving due to a potential difference
Explain heating in terms of work done.
Due to temperature difference caused electrically or by chemical reaction
Explain radiation in terms of work done.
Energy transferred as a wave, eg infrared - infrared radiation are emitted from the sun
what is dissipation?
Dissipation is a term that is often used to describe ways in which energy is wasted
give one example of dissipation.
for a tumble dryer, the electrical work is transferred into useful internal (thermal) energy which helps to dry clothes - energy is dissipated by sound waves
Example of conservation of energy
When a skydiver jumps out of a plane, he begins to lose gravitational potential energy as his height decreases and he gains kinetic energy as his speed increases.
However, Some of the gravitational potential energy is transferred to the air particles and is stored as internal energy.
