Final answer:
It is true that an increase in flow rate and flow velocity leads to an increase in friction or resistance due to the viscosity of the liquid and an increase in head loss, as increased velocity amplifies the viscous drag, and thus head loss, within a system.
Step-by-step explanation:
When the flow rate (Q) increases, the flow velocity (V) typically increases, assuming the cross-sectional area remains constant. However, when the flow velocity increases, there is indeed an increase in friction or resistance to flow caused by the fluid's viscosity and the head loss associated with it. The viscous drag on the fluid and the object moving through it increases with greater velocity. This increase in friction consequently causes an increase in the head loss.
On a fundamental level, for an incompressible fluid flowing through a pipe or channel, the flow rate (Q) is defined as Q = Av, where A is the cross-sectional area of the flow and v is the average flow velocity. An increase in velocity leads to an increase in viscous resistance (R) because the fluid has a higher chance to interact with the sides of the pipe or channel, especially if the flow is turbulent. Therefore, it is true that an increase in flow rate and flow velocity leads to an increase in resistance due to the viscosity of the liquid and an increase in head loss.