Sure, it's just another force. It is a bit tricky at a rotational pivot because there will be a torque as well as a force, but if you're comfortable working with torques around an idealized frictionless pivot you'll be able to introduce the effects of friction naturally.macardoso said:Are we allowed to use free body diagrams in dynamic systems where there is non-negligible friction in say the rotational pivot between two linkages?
Yes, free body diagrams (FBDs) can still be used if friction at the pivot is not negligible. However, you need to include the frictional force in your diagram and equations of motion to accurately analyze the system.
In a free body diagram, friction at the pivot can be represented as a force acting at the pivot point. This force is usually denoted as a frictional force, and its direction is opposite to the direction of motion or impending motion at the pivot.
When including pivot friction in a free body diagram, you need to consider the coefficient of friction, the normal force at the pivot, and the direction of the frictional force. These factors will affect the equations of motion and the overall analysis of the system.
Pivot friction introduces an additional force that must be accounted for in the equations of motion. This force can affect both the linear and rotational dynamics of the system, leading to changes in acceleration, velocity, and displacement calculations.
Yes, you can still apply Newton's laws of motion if friction at the pivot is not negligible. However, you must include the frictional force in your force balance equations and ensure that all forces and torques are accounted for in your analysis.