This could be harmful when you are trying to move something heavy and it doesn't move.
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.
In situations where smooth, frictionless motion is desired for efficiency, such as in industrial machinery. In sports where reducing friction can improve performance, such as in ice skating or surfing. In precision equipment like microscopes or telescopes, where friction can cause inaccuracies in measurements or observations.
i wonder if you mean when is friction not useful ? well; it is useful when you require a surface to hold onto another item . such as the clutch and brake components in a car. a clutch depends on the friction of the metal surface of the clutch plate to drag against another surface to disengage the drive mechanism . A brake system needs the friction between fibre brake shoes and metal case to slow down a car-- vehicle . this is useful. however , in some areas of a car there are parts that require very little friction, such as wheel bearing and inlet and exhaust timing valves which control the operation of fuel ignition timing within engine compartment . these component's have a limited amount of friction but depend upon a coolant such as lubrication oil to ease this friction - action . with an increase in thickness -- measurements the clearances will become less and hence the friction will increase to cause excess heat production . this will cause undesirable heat effect, and expansion and wear and quite likely overheating . ( undesirable result of friction )
Waste energy or dissipative energy are often terms used to describe energy that cannot be efficiently utilized for useful work.
The two types of friction are static friction and kinetic friction. Static friction occurs when two surfaces are at rest relative to each other, while kinetic friction occurs when two surfaces are in motion relative to each other.
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.
The question is Why is internet useful? not why internet is unuseful. I cant find the exact answer if the internet is unuseful to you.
YES
Dams are very useful
like peanut better
In situations where smooth, frictionless motion is desired for efficiency, such as in industrial machinery. In sports where reducing friction can improve performance, such as in ice skating or surfing. In precision equipment like microscopes or telescopes, where friction can cause inaccuracies in measurements or observations.
Whenever you were trying to reach high speeds or conduct exact experiments where friction would slow something down or cause heat. For example, friction is extreamly "unuseful" when spaceshuttles are re-entering the atmosphere because the friction of the spacecraft and the air create incredibly height temperatures. Special heat plates were invented to absorb this heat. If they fail, like in the re-entry of the Columbia Space Shuttle, the shuttle will be completely destroyed.
Some examples of unuseful microbes include certain types of bacteria that cause food spoilage, mold that can damage crops or buildings, and certain types of parasites that cause disease in humans and animals. These microbes are considered unuseful because they do not provide any beneficial impact on their environment or host.
this is so unuseful that this website does not have this answer
it will explode!! or a certain parts will be unuseful
While seasoning, timber can warp, making it unuseful.
this answer was decided that it was unuseful and you should look at another answer.