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energy and energy resources (energy and work (when you work out yo have to…
energy and energy resources
stores
kinetic
chemical
thermal
GPE
elastic potential
energy for a purpose
useful energy
is energy transferred to where it is wanted the way it is wanted
wasted energy
energy that is not usefully transferred
dissipated into surrounding normally
efficiency
energy supplied by device is the input energy
input energy=useful energy output+energy wasted
efficiency=useful energy transferred divided by total input energy supplied to device
closed system
no energy is lost or gained
if you swung a ball from a string in a closed system it would keep going as it looses no energy
energy and work
when you work out yo have to apply a force to do the exercises
this causes transfers of energy
when an object is moved by a force work is done on it.
the amount of energy transferred to the object is equal to the work done on it
energy transferred=work done
one joule of work is done when a force of 1 newton causes an object to move 1 meter
calculating work done by a force
Work done(joules)=force applied(newtons) x distance moved along the line of action of the force (meters)
energy and power
the energy supplied to the motor per second is the power
the more powerful an appliance is the faster the rate at which it transfers energy
power=energy transferred to appliance divided by time taken for energy to be transferred
efficiency = useful power output divided by total power in (x100)