Which term is defined as a dimensionless quantity representing the resistance to rolling?

Which term is defined as a dimensionless quantity representing the resistance to rolling?

• A. Rolling resistance coefficient
• B. Coefficient of friction
• C. Coefficient of resistance
• D. Rolling friction constant

Answer: (A)

Rolling resistance coefficient is a dimensionless quantity that quantifies how much a rolling body resists motion due to deformation losses at the contact patch. It’s defined by the relationship F_rr = C_rr · N, where F_rr is the rolling resistance force and N is the normal load. Because it expresses resistance as a ratio to the load, it is independent of size and is used to compare how different tires, surfaces, or conditions affect rolling loss. This makes it the best choice for describing the resistance to rolling. The coefficient of friction describes resistance to sliding between surfaces, not the energy lost in rolling. A generic coefficient of resistance isn’t a standard term in this context, and rolling friction constant isn’t the conventional name used to capture this effect.

Rolling resistance coefficient is a dimensionless quantity that quantifies how much a rolling body resists motion due to deformation losses at the contact patch. It’s defined by the relationship F_rr = C_rr · N, where F_rr is the rolling resistance force and N is the normal load. Because it expresses resistance as a ratio to the load, it is independent of size and is used to compare how different tires, surfaces, or conditions affect rolling loss. This makes it the best choice for describing the resistance to rolling.

The coefficient of friction describes resistance to sliding between surfaces, not the energy lost in rolling. A generic coefficient of resistance isn’t a standard term in this context, and rolling friction constant isn’t the conventional name used to capture this effect.