A common example of useless friction is rubbing your hands together when they are already warm. This generate unnecessary heat and does not provide any practical benefit.
An example of a non-frictional force is gravitational force. For example, when an object is in free fall, there is no friction acting on it.
A example of friction is rubbing your hands together the heat you feel is friction. Oh dont be a shat head.
A piece of sand paper on a piece of wood is an prime example of rubbing friction.
An example of unuseful friction is when trying to push a heavy object on a rough surface where the friction makes it difficult to move the object smoothly.
Useless energy is known as waste energy or wasted energy. It refers to energy that is not utilized efficiently and is lost in various processes, such as heat escaping from a system or friction in mechanical systems.
friction is rubbing two items together to make friction without is your breaks on the car they would be useless friction causes heat - Brenner Fodt age 12
The word useless can mean "of no use", or to express a hopeless situation. The term is often modified as "not usable for a certain purpose". Example : "The abandoned car was a useless piece of junk." Example : "It is useless to try to avoid doing homework." Example : "An empty fire extinguisher would be useless in a fire."
An example of a non-frictional force is gravitational force. For example, when an object is in free fall, there is no friction acting on it.
Useless is a non-example of practical.
An example of fluid friction is the air resistance felt by an airplane.
Example sentence - Amanda is more useless than a used tissue.
A example of friction is rubbing your hands together the heat you feel is friction. Oh dont be a shat head.
Rolling Friction, Static Friction, Sliding Friction, & fluid Friction
A piece of sand paper on a piece of wood is an prime example of rubbing friction.
An example of unuseful friction is when trying to push a heavy object on a rough surface where the friction makes it difficult to move the object smoothly.
Ice skating is because you dont go fast and there is rarely any friction
hi there! not sure what you mean by "useful friction" but I'm guessing that you're asking "what examples are there where friction is useful" A simple example is that of sandpaper. Where you need to smoothen something and using a smooth (ie frictionless sandpaper) would be useless. A more day to day example would include the friction between your shoes and the ground without which you would be unable to walk with (like skating on ice). In fact, friction is required for you to grab anything (even a book which would slip off your fingers without friction). As for an explicit use of friction there's "Friction Welding" where mechanical friction is used to weld metal together. An article may be found on our friend Wikipedia. http://en.wikipedia.org/wiki/Friction_welding How this helps anybody reading! Cheers!