The mud flies off the tyre of a moving motor cycle in the direction:

In summary, when a motor cycle is moving, the mud on its tire is subject to various forces such as centrifugal force, adhesion, and air friction. As the wheel rotates, the mud is accelerated and eventually breaks off from the tire due to the loss of adhesion. The direction in which the mud flies off depends on the angle at which it breaks off, which can be affected by factors such as humidity and viscosity.
  • #1
shahzadzai
3
0
the mud flies off the tyre of a moving motor cycle in the direction:

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1)towards the center of the wheel
2)towards the circular motion of the wheel
3)along the tangent to the wheel
4)away from the radius of the wheel.
 
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  • #2
Hint: Newton's second law (and what you know about circular motion / centripetal forces and velocities)
 
  • #3
Very complex question this one.

The forces are the following : Centrifugal, Adhesion of the mud and air friction. And the geometry of the wheel imposes a few sections.

The one where the wheel touches the ground and begins to lift of it. Some mud is just vertically accelerated but is not fully bound by the tire so it only rises a bit vertically and slightly forwards. It's the mud that hits the engine hull of the bike, as it moves forward ( the bike hits the mud from a standing point of view).

Next it's the mud that is actually taken with the tire so it is radially( from wheel p.o.v.) accelerated till the adhesion force cannot hold it to the tire. The breaking of the adhesion bond imparts some motion so this mud will fly at a small angle to the tangential.

Of course there is the mud that actually sticks to the tire while it reaches the top. There air friction helps in breaking the adhesion as the top of the wheel moves with twice the speed of the bike. This mud will fly chaotic but will always be somewhere between the tangential and the vertical.

True values for the angles are pointless as mud has many variables like humidity, density, viscosity etc. If water then there is actually a bit of flow going on so that will be even more complicated.
 
  • #4
Welcome to PF!

shahzadzai said:
the mud flies off the tyre of a moving motor cycle in the direction:

--------------------------------------------------------------------------------

1)towards the center of the wheel
2)towards the circular motion of the wheel
3)along the tangent to the wheel
4)away from the radius of the wheel.

Hi shahzadzai! Welcome to PF! :smile:

Mud will only stay on the wheel if there is a force keeping it there.

So mud leaves the wheel when there is no force on it!

Hint: what happens to something when there is no force on it? :wink:
 
  • #5
Tiny-tim..clever observation!
 
  • #6
Hi Naty1! :smile:

:wink: I got the idea from Newton! :wink:​
 
  • #7
I'm not sure about mud, but in the case of water, a Coanda like effect will cause the water to mostly travel along the sidewalls towards the center of the tire before being ejected. It takes long enough that when riding a 10 speed, with no fender, you will get a wet stripe on your back from water that wasn't ejected until it had been "carried" along by the tire.

My best guess is that mud and/or water get ejected in all directions depending on the tire, speed, slippage, and viscosity. That's why they invented fenders.
 
  • #8
Jeff Reid said:
along the sidewalls towards the center of the tire

:confused: Is that what you meant to type?
 

FAQ: The mud flies off the tyre of a moving motor cycle in the direction:

How does the mud fly off the tyre of a moving motor cycle?

The mud flies off the tyre of a moving motor cycle due to a combination of centrifugal force and air resistance. As the tyre rotates, the mud is thrown outwards by centrifugal force and is further propelled by the air resistance created by the movement of the motor cycle.

Does the speed of the motor cycle affect the direction in which the mud flies off?

Yes, the speed of the motor cycle does affect the direction in which the mud flies off the tyre. The faster the motor cycle is moving, the greater the centrifugal force and air resistance, resulting in the mud being thrown off at a greater angle.

Why does the direction of the mud flying off change when the motor cycle turns?

When the motor cycle turns, the direction of the mud flying off changes because the centrifugal force and air resistance are now acting in a different direction. As the tyre turns, the mud is thrown off in the direction of the new centrifugal force and air resistance.

Can the type of terrain affect the direction of the mud flying off the tyre?

Yes, the type of terrain can affect the direction of the mud flying off the tyre. Rough or uneven terrain can cause the tyre to spin in a slightly different direction, resulting in the mud being thrown off at a different angle.

How does the shape of the tyre impact the direction of the mud flying off?

The shape of the tyre can impact the direction of the mud flying off in a few ways. A wider tyre may create more centrifugal force, resulting in the mud being thrown off at a greater angle. Additionally, the tread pattern of the tyre can also affect how the mud is dispersed as it rotates.

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