depends on the bike and the brakes. Go to www.parktool.com or www.sheldonbrown.com for more.
Disc brakes and drum brakes.
if your bike is a u, v or disk brake the cable is probably to tight or if you have hydraulic brakes of any kind your brakes will do this you just have to deal with it
Mechanical disc brakes.
Yes
Brakes are designed to stop things from moving, therefore making it difficult to move a bike that has its brakes on.
Yes
THe brakes rarely need to stop. But the brakes can be used to make the bike stop.
most bmx bikes dont have front brakes now ans if you pedal backward and it has pedal brakes its not a bmx bike
Depends on the type of brakes, but most bike brakes would use levers.
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.
it depends how bad the damage is. If the frame is bent out of shape it would be better to buy a new one but if it's a minor problem like brakes not working or punctured tyres and broken wheels you should just try to fix it.