Piece Drill Bit
physics help please on energy and heat?
A blunt drill becomes hot while drilling a piece of hardwood?
question 1: what form of energy does the drill bit have because of its rotation?
Kinetic (or dynamic) friction occurs when two objects are moving relative to each other and rub together (like a sled on the ground). The coefficient of kinetic friction is typically denoted as μk, and is usually less than the coefficient of static friction. From the mathematical point of view, however, the difference between static and kinematic friction is of minor importance: Let us have a coefficient of friction which depends on the displacement velocity and is such that its value at 0 (the static friction μs ) is the limit of the kinetic friction μk for the velocity tending to zero. Then a solution of the contact problem with such Coulomb friction solves also the problem with the original μk and any static friction greater than that limit.
Constructing a Drill Bit for Water Well Drilling Using the Baptist Method
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