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ConservationofEnergyFriction - Conservation of Energy...

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Conservation of Energy & Friction Consider a block that is given an initial velocity V o on a horizontal surface where μ = μ k . The block comes to a stop due to the frictional force acting on it. Let’s define the isolated system to be the block + surface. s M M v o v f = 0 system = block + surface Recall that the work done by all the external forces acting on a system is given by: (1) ext mech sys sys W E K U = ∆ = ∆ + ∆ Because 0 ext W = ( there are NO external forces acting on the system) and U sys = 0 , then this implies that K sys = 0 . However we know that 2 1 2 sys o K Mv = − . Since we have an isolated system there is no transfer of energy into or out of system and since energy cannot be created or destroyed, where did the decrease in energy (kinetic) of the system go? The decrease in energy (kinetic) of the system
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