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Badly phrased, not enough information
I hope you mean speed, if not I'm at a loss for words. Friction effects both the contact between the wheels and the ground, as well as your shoe and the grip tape. You would like a high coefficient of static friction between the ground and your wheels so you don't end up skidding, fishtailing, and later flat-out falling down. Also, you would want a medium-level coefficient of kinetic friction and possible a medium-high coefficient of static friction between the grip tape and your shoe in order to grip the board, yet still be able to slide your foot for flip tricks. If the coefficient of static friction between the grip tape and your board is too high, it won't flip properly as it might overflip or flip on an unusual axis if it were to be too low. As you use the grip tape, both coefficients will decrease because the grains on the grip tape will be smaller and easier to pass over with a lesser repelling force of friction. Coming from a skateboarder in college-level physics.
as we know during experiments, we cant go with or have the actual accuracy requried same here heads are not properly maintaied constant during exeperment.
You would start sliding forever or trip in an instant and would not be able to stand up and walk properly without holding onto an object. Because friction is what keeps your feet remain still on the ground.
Friction by spinning a wooden stick in a hole in a second piece of wood. A wheel bearing not properly lubricated
Badly phrased, not enough information
I hope you mean speed, if not I'm at a loss for words. Friction effects both the contact between the wheels and the ground, as well as your shoe and the grip tape. You would like a high coefficient of static friction between the ground and your wheels so you don't end up skidding, fishtailing, and later flat-out falling down. Also, you would want a medium-level coefficient of kinetic friction and possible a medium-high coefficient of static friction between the grip tape and your shoe in order to grip the board, yet still be able to slide your foot for flip tricks. If the coefficient of static friction between the grip tape and your board is too high, it won't flip properly as it might overflip or flip on an unusual axis if it were to be too low. As you use the grip tape, both coefficients will decrease because the grains on the grip tape will be smaller and easier to pass over with a lesser repelling force of friction. Coming from a skateboarder in college-level physics.
Because without the friction on animals the the neutrons of the atoms would not be able to work properly.
If it wasn't properly lubed before, then efficieny will be improved by lubricating. If it was properly lubed before, nothing much will happen.
Very low CTE - coefficient of thermal expansion.
Yes.Yes.Yes.Yes.
with the kickstand down to induce crashing friction
One must measure the coefficient of disparity in a demand supply curve properly.
yes almost every moving and moving object has to do with friction. Friction is force resisting the relative motion of two surfaces in contact or a surface, Such as skate board wheels and the ground.
Wax the exterior and keep it clean. Keep tires properly inflated.
Walking , if there is no friction you wont be able to walk properly . Another important thing is driving . In the absence of friction the car wheels wont be able to rotate probably thus the car will just go in circles.
That cannot be properly answered unless you specify how fast you are traveling.