The loss of kinetic energy of the axe head equals the work that if does splitting the log. That equals (average force) x (penetration distance)
Use that fact to solve for the average force
Energy, or the change in energy, never equals power. Power is energy per time
Oh goodness, another review question.
"The 2.0kg head of an axe strikes a tree horizontally at 40 m/s. The blade penetrates 0.040 m into the tree. What is the average force exerted by the blade on this tree?
Is this just net force? Why do they give you the distance the axe penetrates into the tree? None of my formulas quite seem to fit.
PS. I think a change in kinetic energy=power, yes? Or am I totally out to lunch?
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