(e) None of the above 68th B.P.S.C. (Pre) 2023
Which of the following energy changes involves frictional force?
aKinetic energy to heat energy✓ Correct
bPotential energy to sound energy
cChemical energy to heat energy
dMore than one of the above
eNone of the above 68th B.P.S.C. (Pre) 2023
Explanation
Frictional force acts both in stationary and in moving conditions. The coefficients related to friction are called the coefficient of static friction and the coefficient of kinetic friction. In a stationary condition, there is no displacement; hence no work is done and no energy conversion takes place. But in a moving condition, motion occurs against friction, due to which energy is lost in the form of heat. In other words, kinetic energy is converted into heat energy.
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