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Homework Statement
whats the energy required to drag a block a distance L
Homework Equations
coefficiant of friction between block and floor = [tex]\mu[/tex]
density of block = p
force*distance = change in kinetic energy
The Attempt at a Solution
friction acting against movement Fr = [tex]\mu[/tex]mg m = mass of block
force in direction of movement F = ma
resultant force = F - Fr = m(a-[tex]\mu[/tex]g)
resultant force*L = energy = m(a-[tex]\mu[/tex]g)L
i dont think the last step is right though as im not sure sure that the assumption made that energy required is the same as the change in KE is correct...
help or guidance appreciated