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kinetic energy
Energy of motion, equivalent to one-half an object's mass multiplied by its velocity squared. If a body of mass m has an initial velocity u and is accelerated by a constant force F to velocity of v then from Newton's laws of motion, v2 = u2 + 2as and the definition of force F = ma, then the work done is equal to Fs.
W = FsIf the body starts from rest, u = 0 and so the work done on it would be ½mv2. This gives the amount of energy that any moving body of mass m traveling at velocity v has.
but F = ma and s = ½a(v2 - u2)
so W = ½m(v2 - u2)
= ½mv2 - ½mu2
Compare with potential energy.
Related category
• CLASSICAL MECHANICS
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