Friction is sometimes not useful as when a player drives forward in a wet condition the ball slows down due to the friction so it is harder to control and difficult to get a shot away. Also a player can lose momentum during fast strides or slip in wet conditions. The ball will slow down because of the friction with the grass so it is easier for the goalkeeper to save it.
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.
Friction can be unuseful when trying to achieve smooth motion in machines or when trying to move heavy objects. It can generate heat and cause wear and tear, leading to inefficiencies and increased energy consumption. In certain applications, such as in some precision instruments or machinery, reducing friction is desirable.
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.
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.
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Friction is not required in sports like swimming and diving because it is beneficial for athletes to move through water with minimum resistance. Additionally, in sports like gymnastics and figure skating, reduced friction allows for smoother and more controlled movements during routines.
YES
Dams are very useful
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action and reaction, the ball moves with force, it stops with friction .
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.
Ice skating does not require any friction because the skater needs to glide on the ice and if there was any friction on ice the skater would have trouble to skate smoothly on the ice. That is why ice skating does not require any friction at all from my perspective.