Technician A says that if the coefficient of friction is too low, the brakes will grab.

Technician B says that the coefficient of friction is influenced by the materials in contact.

Who is right?

Only Technician B is right

Explanation:

Technician A is wrong because the brakes will grab and cause the wheel to lock up and slide only if the coefficient of friction is too high. If the coefficient of friction is too low, excessive pressure on the brake pedal will be required to stop the vehicle.

Technician B is right the materials in contact is a factor that influences the coefficient of friction. For example, when ice slides on steel, the two materials slide past each other easily, this means that icehas a low coefficient of friction. On the other hand, rubber on pavement has a high coefficient of friction as the materials do not slide past each other easily.

Therefore, only Technician B is right.