Work Energy and Power Flashcards
what is the definition of Ek (kinetic energy)
the energy an object has due to its motion
what is the definition of g.p.e?
the energy stored in a mass due to its position in a gravitational field
what is the formula to calculate g.p.e
m X g X h
where
m = mass
g = gravity
h = hight
what is the definition of power?
the rate at which work is done
or
the rate at which energy is transferred
what energy is stored in a spring?
elastic potential energy
define g.p.e
the energy an object has by virtue of its position in a gravitational field
what does it mean when energy is disipated
it means energy is being wasted into other forms
what is efficiency?
the ratio of the useful energy output from the system to the total energy input
what is the formula for efficiency?
(useful energy output/total energy input) X 100%
what is the symbol for efficiency?
eta - η
define work
the product of force and displacement in the direction of motion
if the force is in the direction of displacement then does the object gain or lose energy?
it gains energy
if the force is in the direction opposite to the displacement then will the object gain or lose energy?
it will lose energy
