A system comprising two blocks is shown, one of which is on an inclined plane. T

Question

A system comprising two blocks is shown, one of which is on an inclined plane. The pulley is of negligible mass and is frictionless. The system starts from rest at position 1 and accelerates. Measurements taken when the blocks reach position 2 indicate that the kinetic energy of block A has changed by 330 J; the potential energy of block A has changed by 588 J; the kinetic energy of block B has changed by 110 J; and the potential energy of block B has changed by 98 J. The amount of mechanical energy that has been converted to heat because of friction is

Explanation / Answer

delta KA = +330 J

delta UA = -588 J

delta KB = 110 J

delta UB = +98 J

work done by friction = delta KA +delta UA + delta KB + delta UB

wf = 330-588+110+98

= -50 J

woek done by friction is disipated as heat

Q = 50 J

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