Yes.. the one about the normal force belongs in the "Forces" post. Unfortunately, my permission to edit it seems to have been taken away again. I'm forming the impression that a blog system (where an item is published and becomes cast in stone, only modifiable by a comment chain) is not suitable for what I thought this was about. It doesn't make a for usable reference text.robphy said:
A wrench can produce torque without friction. So can an electric motor. Or tidal gravity. Or a windmill [where, to be clear, it can be the "lift" that is producing torque and the "drag" is not essential].AdityaDev said:
I was talking about one particular case. Also, If the wrench was frictionless, It will simply slide instead of rotating the object right?jbriggs444 said:
Most wrenches (box end, open end, adjustable, socket, etc) push on the faces of hexagonal and square nuts and bolts at a position offset from the center of the face. Friction is unimportant to their use.AdityaDev said:
The most common errors made in mechanics when dealing with friction include underestimating the effects of friction, assuming friction is always static, neglecting the direction of friction, and failing to consider the type of surface and its roughness.
Underestimating the effects of friction can lead to inaccurate results in mechanics calculations. Friction is a force that opposes motion and can significantly impact the movement of objects, especially when dealing with high speeds or heavy objects. Neglecting to consider friction can result in errors and incorrect predictions.
Static friction is the force that prevents an object from moving when a force is applied to it. Kinetic friction, on the other hand, is the force that opposes the movement of an object that is already in motion. Both types of friction are important to consider in mechanics calculations, and neglecting one or the other can lead to errors.
The type of surface and its roughness can greatly affect the amount of friction present in a system. For example, a rough surface will have more friction than a smooth surface, and different materials may have different coefficients of friction. It is important to consider these factors when calculating friction in mechanics problems.
To minimize errors when dealing with friction in mechanics, it is important to accurately measure and account for all the factors that can affect friction, such as surface type, roughness, and the direction of the force. It is also helpful to double-check calculations and use real-world examples to validate the results.