A grip is a plastic, or rubber, or cork, or leather sleeve that goes on the end of the handlebar, to make holding on easier and more comfortable.
a grip in sports is where you get the hang of it and you get better and better
Twist the grip.
The brakes use friction to stop the bike and the tyres use friction to grip the road.
make one.cut off a grip of a bike of scooter
it gets hot
So they will grip when you lean the bike to turn.
Yes but the nobbly tyres don't grip on tarmac in the wet.
No. Grips and handlebars are fairly well standardized, so pretty much any grip will fit.
small, with black plastic finger grip on it,
The governor is the screw by the throttle on the hand grip take it out and no more governor.
Not if you're riding with care. Skidding can damage the surface though. And whoever that's in charge of the track might not want to share it with bicyclists.
The hardness of the rubber. Softer rubber gives better grip on rock, but wear faster.
It all depends. A knobbly tyre will have a poorer grip on a smooth surface than a smooth tyre, while a smooth tyre will have poorer grip on a loose surface than a knobbly tyre. But overall a smooth-tyred road bike, on a smooth and clean road, can brake and corner harder w/o skidding than a bike with knobbly tires can.