Frequently Asked Question:

If a motorcycle accelerates too rapidly, its front wheel will rise up off the pavement. During this stunt the?

If a motorcycle accelerates too rapidly, its front wheel will rise up off the pavement. During this stunt the pavement is exerting a forward frictional force on the rear wheel. How does that frictional force cause the front wheel to rise?

Answer by jimanddottaylor
If there is enough force applied. the rear wheel would spin. But if the frictional force is sufficient, then wheel will not spin , but because of an equal and opposite force the motorbike will tend to revolve around the wheel in the opposite direction, Thus raising the front wheel/ (or words to that effect in the physics course you are taking)

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7 Responses to If a motorcycle accelerates too rapidly, its front wheel will rise up off the pavement. During this stunt the?

Candid Chris says:

August 27, 2011 at 2:27 pm

The dynamics of one powered gyroscope (the rear wheel) in alignment with a nonpowered gyro (the front wheel) has a tendency to be able to overpower the other.
Sometimes the friction rate of the two surfaces (tire tread – pavement) are unequal.
If the rate is strong the power of the engine can lift the nonpowered front gyro off the pavement, in MC terms, that’s a ‘wheelie’. If the rate is weak the powered gyro will overpower the friction rate causing what is known in the “motor-world’ as a burn out…..
……… I could write your whole paper BUT I’m lazy tonight.
Bob A says:

August 27, 2011 at 2:42 pm

It’s as simple as this torque over comes weight and leverage.
Firecracker . says:

August 27, 2011 at 2:55 pm

Bob’s answer is correct, and the frictional force is applied to the pavement by the rear wheel – the opposite of what you wrote.
James says:

August 27, 2011 at 3:08 pm

The rear tire exerts an accelerating force forward at the rear axle. Since the centre of mass of the rider and bike is higher than the axle, it is able to rotate around the axle, due to inertia.. If the centre of mass were lower than the rear axle, then acceleration would actually add down-force at the front tire contact patch.
Mark S says:

August 27, 2011 at 3:19 pm

A torque is applied about the rear axle – this is the torque that drives the wheel/tire that provides a rearward frictional force against the pavement, pushing the bike forward.

Remember, for every force there is an equal and opposite reaction force – this opposite force is a torque on the frame (also around the rear axle) which wants to turn the frame in the opposite direction to that of the rear wheel – when there is enough torque, it will lift the front wheel.
Everything Sportbikes says:

August 27, 2011 at 3:51 pm

The coefficient of the tire to ground is more than the power applied, so the rear of the bike will literally try to overtake the bike by walking under it.this is the only way for this to happen as the front tire is not attached to the ground. This is why you will notice a drag bike is so low to the ground and a longer wheel base. It results in a lower center of gravity, reducing the the bikes ability to overcome the weight of the bike to overtake it.
Dan says:

August 27, 2011 at 4:15 pm

It is the TORQUE REACTION of the frame spinning around the rear axle.
Shift weight forward to counter or balance/