energy,work and power Flashcards
energy
something that assist in doing some mechanical or electrical work
E.C.P
it states that the total energy in a system before an event and after an event is always equal or the total energy of a system is always conserved
kinetic
energy possesed by object moving object
potential
energy possesed by object due to their position or configuration
G.P.E
-the energy possesed by objects due to the height from surface of the earth
-mgh
elastical potential energy
energy stored in rubber bands
work
when an applied force displaces an object through some displacement
work(formula)
force x displacement
work(unit)
Nm
power
it is defined as the ratio of doing work
poer(formula)
work done/time
power(unit)
Watt(W)
power(2nd formula)
force x velocity
efficiency
it is the ratio of useful output work(energy) to total input work
efficiency formula
useful energy/total energy
