the area around an object where it can exert a force on another object.
when is an electric field created?
around any externally charged object
what does the larger the power of an object mean?
the more work it does per second.
what does a force doing work often cause?
a rise in temperature as energy is dissipated to the thermal energy stores of the moving object and its surroundings. This means that the process is wasteful and the efficiency of the process is reduced.
what is the equation for efficiency?
useful energy transferred by device/total energy supplied to device
what happens when a force moves an object through a distance?
work is done on the object and energy is transferred
what when a force does 'work' on an object?
energy is transferred mechanically from one store to another.
when is one joule of work done?
when a force of one newton causes a object to move a distance of one metre (1J=1Nm)
what are the 4 things energy can be transformed by?
heating
electrical work
waves
mechanical work
when is more work done?
when you push with the same force for a longer distance
when you push with a larger force for the same distance