Question

Technician a says the frictional energy on the drum surface creates heat, and this heat is dissipated to the surrounding air as the drum rotates with the wheel. technician b says the thinner a drum gets, the better its ability to absorb and release heat. who is correct?

O A only
O B only
O Both A and B
O Neither A nor B

Answer 1

Only Technician A is correct as frictional energy from the drum surface does create heat that is dissipated into the air, but Technician B is incorrect because a thinner drum is not more effective at absorbing and releasing heat.

Step-by-step explanation:

The correct answer is option A only. Technician A states that the frictional energy on the drum surface creates heat, and this heat is dissipated to the surrounding air as the drum rotates with the wheel. This is correct, as when the brakes are applied, the motion energy is converted into heat energy due to friction, similar to how rubbing surfaces together generates heat.

Technician B, however, suggests that the thinner a drum gets, the better its ability to absorb and release heat. This is incorrect because as a brake drum becomes thinner through wear, it can actually dissipate heat less effectively, making it more susceptible to overheating and possibly brake failure. The ability of a material to absorb and release heat efficiently is typically related to its mass and the properties of the material, not merely its thinness.