On which two factors does motor speed depend?

Motor speed in hydraulic systems is primarily influenced by displacement and flow rate. Displacement refers to the volume of hydraulic fluid that is moved per revolution of the motor. A higher displacement means that for each cycle, the motor displaces more fluid, which can result in a higher speed.

Flow rate, on the other hand, represents the volume of fluid that is supplied to the motor over a specific period. If the flow rate is increased, the motor receives more fluid, which can also lead to increased speed, provided that other factors like load aren't restricting the motor's performance. Therefore, understanding the relationship between displacement and flow rate is crucial for predicting and controlling motor speed in hydraulic applications.

The other options do not directly influence motor speed in the same fundamental way. For example, while voltage and torque relate to electrical motors, they do not capture the essential parameters of hydraulic motor performance. Pressure and load are important for determining how much work the motor can do or how efficiently it operates but they are not direct determinants of speed alone. Friction and lubrication are important in maintaining the operational integrity of the components but do not directly influence the motor's speed in terms of hydraulic systems.