Energy Transfers, Work & Power Flashcards
What are 8 examples of energy stores?
Chemical, kinetic, gravitational, elastic, thermal, magnetic, electrostatic and nuclear
What are 4 examples of energy transfers?
Mechanically, electrically, by heating, by radiation (light/sound)
What is a magnetic energy story?
Energy stored when repelling poles are pushed together or when attracting poles have been pulled apart
What is a thermal energy store?
Total kinetic and potential energy of particles in an object (eg. Vibrations)
What is a chemical energy store?
The energy stored in chemical bonds (eg. Between molecules)
What is kinetic energy store?
The energy of a moving object
What is an Electrostatic energy store?
The energy stored when repelling charges have been moved closer together OR attracting forces, pulled apart
What is the energy store of elastic potential?
The energy stored when an object is stretch or squashed
What is the energy store of gravitational potential?
The energy of an object at height
What is the energy store for nuclear energy?
The energy stored in the nucleus of an atom
What is the principle of the conservation of energy?
Energy is neither created or destroyed but it can transform from one type to another
What is the principle of the conservation of energy?
Energy is neither created or destroyed but it can transform from one type to another
What is the relationship between efficiency, useful energy output and total energy output?
Efficiency = (useful energy output / total energy output) x 100%
What do Sankey diagrams help us see?
What happens to the energy input in a system and how much of the energy was used and wasted
How do we read Sankey diagrams?
The width of the arrow is proportional to the amount of energy (eg. 70 Joules = 7cm)
What is the relationship between work, force and distance moved in the direction of that force?
Work done = force x distance moved
W = F x d
What is significant about the work done and the energy transferred?
They are equal
What is the relationship between Gravitational potential energy, mass, g and height?
Gravitational potential energy = mass x g x height
GPE = m x g x h
What is the relationship between Gravitational potential energy, mass, g and height?
Gravitational potential energy = mass x g x height
GPE = m x g x h
What is the relationship between Gravitational potential energy, mass, g and height?
Gravitational potential energy = mass x g x height
GPE = m x g x h
What is the relationship between kinetic energy, mass and speed?
Kinetic energy = 1/2 x mass x (speed)2
KE = 1/2 x m x (v)2
How does the conservation of energy produce a link between potential energy, kinetic energy and work?
When a falling object hits ground and stops, the kinetic energy is transferred to the ground in form of work done dropping it (eg. Throwing).
What is power?
The rate of transfer of energy or the rate of doing work
What is the relationship between power, work done (energy transferred) and time taken?
Power = work done / time taken
p =w/t
