Sand on an icy street.
Undesirable is an example.
Frictions
Lactose tolerance
Unhelpful frictions are obstacles or barriers that impede progress, efficiency, or communication within a system or process. These can include excessive bureaucracy, conflicting instructions, lack of clarity, or outdated technology. Identifying and removing unhelpful frictions can lead to smoother operations and improved outcomes.
Are all changes desirable? Clearly not. Example: "lets change the notion of educating our children, to never educating them" All changes are not desirable. Then ask: Is any change always desirable? No. Should the prospect of change be desirable? Sometimes. The answer depends on perception, intention and outcome. The only truth with almost near certainty is to state the following: Change can be desirable.
Current example
It slows it down and/or creates heat.
Getting in or out of a bathtub.
Friction belongs in between two contacting surfaces
In the operation of a seesaw, some energy is lost to friction.
To avoid frictions and also prevent from damage of an insects
Fluid friction occurs when a solid object moves through a fluid.