EPE – Calories- Law of Conservation of Energy and Work-Energy Theorem. Another type of PE is… Elastic Potential Energy( EPE) Energy stored in an obj. at its stretched or compressed state. Obj. will return to its original or relaxed length. Elastic Potential Energy.
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Another type of PE is…Elastic Potential Energy( EPE)Energy stored in an obj. at its stretched or compressed state.Obj. will return to its original or relaxed length.
EPE - elastic potential energy, J
(indicates how easily a material stretches or compresses
‘higher k stiffer material’
from relaxed length ( x = ℓs - ℓr ) or ( x = ℓr - ℓc )
( ℓr = relaxed length )
( ℓs = stretched length ) or ( ℓc = compressed length )
The total energy of a closed,
isolated system is constant
KE1 + GPE1 + EPE1 = KE2 + GPE2 +EPE2
½ mv12 + mgh1 + ½ kx12 = ½ mv2 2 + mgh2 + ½ kx2 2
GPE(t)op + KE(t)op = GPE(b)ottom + KE(b)ottom
According to the Work-Energy theorem,
the work done on an object, by the net
force acting on it, is equal to the change
in kinetic energy of the body
Work = Δ KE
F*d = KEf – KEi
F*d = ½ m vf 2 – ½ m vi2
F*d = ½ m (vf2 – vi2)