Brakes are meant to have a lot of friction and it's useful.
Friction is helpful so you dont fall and friction helps things work much better than others. friction can also be helpfull when someone is driving. for an example on a slippery road frictio between the tires and the road stops the cars from sliding off the road and crashing. In sports friction stops the ball from going on forever. without friction we would just keep going on and on with out stopping. friction helps stop a bicycle from going on forever when we push the brakes in a bicycle it creates friction, which slows us down to a stop.
Yes, they can. It tends to happen more rapidly in heavy duty vehicles with air brakes, but it can happen in light duty vehicles with hydraulic brakes, as well. Brakes create friction, friction creates heat. Too much of it, and they overheat.
It could be air in the brake line, or the brakes getting too hot from too much friction by using the brakes on a steep hill or riding the brakes, or there could be a problem with the master cylinder.
To set bicycle brakes properly, start by squeezing the brake lever to see how much it moves before the brakes engage. Adjust the brake cable tension using the barrel adjuster until the brakes engage when the lever is pressed about halfway. Make sure the brake pads are aligned with the rim and not rubbing on the tire. Test the brakes by riding slowly and squeezing the levers to ensure they stop the bike smoothly.
The coefficient of friction for bicycle tires can vary depending on the tire material, road surface, and weather conditions. However, a typical range is between 0.4 and 0.7 for dry conditions and around 0.3 for wet conditions.
If it wasn't properly lubed before, then efficieny will be improved by lubricating. If it was properly lubed before, nothing much will happen.
There is friction between the rubber tires and the road or other riding surface.There resistance to the rider moving through the air.The bicycle's chain, pedals, gears, etc all develop frictional forces.
Friction can be useful to control the speed of the slide and prevent the person from sliding too fast. However, too much friction can cause the person to come to a sudden stop or experience discomfort. Finding the right balance of friction is important for a smooth and enjoyable slide experience.
Lots of friction in the world, some useful, some harmful. But friction is not something that merely exists or does not. It can be measured, and a thing can be said to have too little, too much, or a good amount. If you get a rope burn, when a rope you are holding slips in your hands, that is harmful friction. Friction causes a car to stop when the breaks are put on. An ice skater uses skates because they get traction with their sharp edges, but there is low friction on the blade to slide on the ice. If you were on a roof made of asphalt tiles, and the roof were not too steep, it would be friction that holds you in place. You would know better than to go on the roof if it were covered by ice, because the friction would be too low - it would be slippery.
"Weight weenies are a list of how much different bicycle parts weigh. This may include the brakes, wheels, frame, seat, etc..."
Too complex to answer here. Have a look at www.parktool.com, www.sheldonbrown.com or www.biketutor.com and read more.
Yes, friction is useful on a slide because it helps to slow you down and prevent you from sliding too quickly or uncontrollably. It also provides enough grip for you to stay on the slide without slipping off.