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In what way is friction useful to a skydiver?
Friction (from air resistance) stops them from falling faster and faster continually - instead they reach a maximum velocity and stay at that speed until they pull their parachute. Friction prevents them from plummeting to their death.
What are advantages of wheel?
Rolling friction is less than sliding friction so it is easier to move heavier objects using wheels.
When you stand on a slope why don't you slide?
That depends on the friction, or grip, between your feet and the surface you are standing on. Its a battle between gravity and friction. If you are in bare feet on ice, mud, or wet grass or clay, gravity wins and you take a tumble. If you are wearing hiking boots on rock, stone, or any surface with a little friction, friction wins.
What is the unit measure of friction?
As friction is also just a type of force (an oppsoing force), it's standard unit is also Newton as of any other force.
How can you find the coefficient of friction force only given mass and theta?
The coefficient of friction is the tangent of the angle theta where the angle is measured from horizontal when the mass first starts to slip
