The friction is useful on a bike when you push it.
It is helpful for when you walk .
how does friction help car tyres?
Friction is useful when you are trying to stop a car, but not useful in the pistons of a car's engine (It makes them less efficient).
It's useful
Friction is useful when I want to stand up (trying to stand on a frictionless surface is difficult, and dangerous), but more friction is a problem when I am ice skating. Friction with my car tires is useful when I am driving on a road (especially if I want to stay on the road around a curve, or want to speed up or slow down), but more friction on the moving parts of the engine is a problem.
Brakes are meant to have a lot of friction and it's useful.
The brakes! And the tires (no friction = no traction).
Brakes, and Shoes
yes.
Yes, and the heat generated is the converted momentum of slowing down.
A bicycle has high friction at the brakes, first and foremost. Then at places where the rider holds on to the bike, Grips and pedals. Between tires and road.
Wooden match and car brakes
A child applying the brakes on his bike is an example of sliding friction, as the brake pads create friction against the bike's wheels to slow it down.
No brakes on anything work because of gravity. Pressure and friction are what stop anything utilizing brakes. On a bike, you pull the brake lever on the handle bar and it pulls the line connected to your brakes. The two brakes pads on either side of your wheel compress, applying friction and thus stopping your bike. The harder you pull, the faster you stop.
That is because of Friction. It is called heat friction and when you slow down after the brakes rub so hard against each other, it generates a lot of heat. also, you can check Wikipedia for more about heat friction.
When the brakes of a bike are engaged, they create friction against the wheels, which slows down their rotation. This friction converts the kinetic energy of the moving bike into thermal energy, causing the bike to decelerate. The brake pads press against the wheel rims (in rim brakes) or against the disc (in disc brakes), effectively reducing the bike's speed until it stops. The process is influenced by the force applied to the brakes and the condition of the brake components.
Friction causes the bike to slow down.