Energy P1 Flashcards
Kinetic Energy= 0.5 x mass x (speed) 2
Ek =1/2 m v2
gravitational potential energy = mass x gravitational field strength (g) x height
Ep= m g h
power= energy transferred/time
P = E/t
efficiency ?
useful power output/ total power input
elastic potential energy= 0.5 x spring constant x (extension)2
Ee= 1/2 K e2
work done = force x distance (along the line of action of the force )
W= F s
what are the different types of energy stores?
magnetic internal (thermal) chemical kinetic electrostatic elastic potential gravitational potential nuclear
magnetic energy?
The energy stored when repelling poles have been pushed closer together or when attracting poles have been pulled further apart. Fridge magnets, compasses, maglev trains which use magnetic levitation.
Internal (thermal) energy
The total kinetic and potential energy of the particles in an object, in most cases this is the vibrations - also known as the kinetic energy - of particles. In hotter objects, the particles have more internal energy and vibrate faster. Human bodies, hot coffees, stoves or hobs. Ice particles vibrate slower, but still have energy.
Chemical energy
The energy stored in chemical bonds, such as those between molecules. Foods, muscles, electrical cells.
Kinetic energy
The energy of a moving object. Runners, buses, comets.
Electrostatic energy
The energy stored when repelling charges have been moved closer together or when attracting charges have been pulled further apart. Thunderclouds, Van De Graaff generators
Elastic potential energy
The energy stored when an object is stretched or squashed. Drawn catapults, compressed springs, inflated balloons.
Gravitational potential energy
.the energy an object has due to its height. Aeroplanes, kites, mugs on a table.
Nuclear
The energy stored in the nucleus of an atom. Uranium nuclear power, nuclear reactors.
Work done?
force applied x distance moved
Energy stores?
Thermal, kinetic, light, Gravitational potential, chemical, sound, electric , elastic , nuclear
Conservation of energy:
it can not be destroyed or created only transferred
Ep?
Ep= mgh
Ek?
Ek= 1/2 mv2
Ee?
1/2 Ke2
power is the rate of transfer
P?
P= E/t
conductors?
a conductor is a material that transfers energy by conduction. a good conductor transfers energy quickly
insulators?
an insulator are materials which slow down the rate of energy transfer, and can be used to reduce energy loss in homes.
