why back part of the bike get lifted up when brakes are applyed to it while moving on high speed?

Answer 1

Its called a stoppie or nose wheelie

for your next trick try riding backwards while doing a wheelie

keep practicing for X games

Answer 2

No, there is NOT more braking strength in the rear! If you believe that, you're headed for a serious highside crash!

The rear of the bike gets lifted because your body weight is acting as a lever pushing forward against the compression and damping of the suspension, with the center of gravity acting as the pivot point.

Too much? Think of it this way: if you're bringing Chinese takeout home in the car and someone cuts in front of you, you slam on the brakes. The car stops, and your seatbelt keeps you from hitting the steering wheel (you DO wear a seatbelt, right?).

But one of Newton's laws of motion states that objects in motion will remain in motion until there is an opposing force to alter or cancel that motion. This means that while the car is moving, the Chinese food is also moving. But when you hit the brakes and the car stops, there isn't much keeping the food from continuing its path onto the floor.

A motorcycle has suspension, front and rear. When you hit the brakes, the only think keeping you (Chinese food) from flying off the seat is you holding on for dear life. But the weight of your body still continues forward, compressing the front suspension and, things being equal, extending the rear suspension which lifts the back of the bike.

This is also why the front brake is more effective than the rear. If you have no weight pushing down on the rear tire from the previous weight transfer, there is a loss of friction where the tire contacts the road. This is why new riders can crash badly.

Driving a car gets you used to pushing with your foot to brake harder, which is the rear brake on a motorcycle (the right lever is the front brake). In a panic, your body does what it's trained to do which in most cases means slamming your foot into the brake lever and locking up the rear wheel.

One of three things can happen at this point. The best one is to control the skid and keep the bike straight, but this is difficult. The other two involve the rear tire sliding out until the bike "lays down" in what's called a lowside crash.

But the worst one is when the tire slides sideways and the rider lets go of the rear brake. Motorcycle tires are VERY grippy, and if the tire decides to grip while the bike is sideways, the whole bike will flip itself over, catapulting the rider into the air.

The rider then impacts the pavement hard before sliding, and the bike follows right behind to crush the rider against whatever he slides into. This is known as a "highside" and is probably the worst way to crash (other than going straight into a wall).

It takes years of experience to understand how to control a motorcycle, but it's a lot of fun if you're careful.

Answer 3

i m afraid the answers given earlier are not truely correct...

suuden appication of the brakes results in the wieght transfer in the bikes and not just because of inertia
Lifting the Rear Wheel
The Zen principle behind this number is to make your handle bars accelerate faster than the front wheel. To get a feel for the sensation - leap off your mount, grab a fistful of front brake so the wheel locks up, and twist the handle bars forward, pushing the bike over its front wheel. The rear wheel will pop up like a slice of raisin toast. Then try it without using the brake - by gripping the handle bars tightly and rolling your wrists forward with an explosive action.
Now try the real thing. Find a smooth, flat area and ride at a moderate speed in a straight line. Now ...
1. Grip your handle bars tightly, so your knuckles are white!
2. Get out of the saddle and move your weight forward until your head is well forward of the front axle. Your arms rather than your feet should now be supporting most of your body weight.
3. Twist the handle bars and push the bike forward with an explosive action (don't touch the brakes or you'll stack it big time).
4. Your legs should be relaxed, bent slightly to allow the bike to rise under you. The rear wheel will momentarily lift off the ground - a scary sensation but fear not ... you're unlikely to head over heels. Thanks to Mr Newton, as you push the bike forward your body automatically moves back to return the rear wheel to terra firma.

NOTE : THIS IS THE REASON Y WHEN THE FRONT BREAK IS APPLIED REAR WHEELS RISE....BUT WHEN REAR BREAKS ARE ALONE APPLIED THE FRONT WHEEL DOES NOT RISE AND REAR WHEEL WILL JUST SKID ..... CAUSING U A BONE FRACTURE.........

Answer 4

Its all about weight tranfer. You applied front brakes the weight transfered to the front wheel. Simple as that. Even if you apply both since the front is in the direction of travel the rear will lift on the bike (not off the ground just unloading suspension unless alot of front brake is applied) Using just the rear the rear end wont rise but then again the bike will have a hard time slowing down and loss of control is likely to happen.

Answer 5

Law of inertia.

a body tends to be in motion or rest until an external force acts on it. so when u are travelling at speed. and when front brakes are applied the back wheels still tend to keep moving but the only place to go is up so depending on the speed u get a flip flop for the bike and a broken bone for u if u r lucky.

Answer 6

It only happens if the front brakes are applied first or the front wheel comes to a halt before the rear wheel If both the brakes are applied simultaneously then this does not happen

Answer 7

Coz more braking strength is there in rear ! Ok bye !

Answer 8

THE FRONT BRAKES WERE APPLIED WITH MORE PRESSURE THAN REAR .INERTIA

Answer 9

Well heres the deal....I won't go into lengthy explaination....but.....please quit riding motorcycles if you can't figure that out.... thanks