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

  • Context: High School 
  • Thread starter Thread starter shahzadzai
  • Start date Start date
  • Tags Tags
    Cycle Direction Motor
Click For Summary
SUMMARY

The discussion centers on the dynamics of mud ejection from a motorcycle tire during motion, emphasizing the impact of centrifugal forces, adhesion, and air friction. Key points include that mud is ejected primarily along the tangent to the wheel and at angles influenced by the tire's speed and the properties of the mud. The complexity of the mud's behavior is attributed to variables such as humidity, density, and viscosity, which affect how it adheres to and is released from the tire. Newton's second law and principles of circular motion are fundamental to understanding these dynamics.

PREREQUISITES
  • Understanding of Newton's second law
  • Familiarity with circular motion and centripetal forces
  • Basic knowledge of fluid dynamics, particularly viscosity and adhesion
  • Concepts of air friction and its effects on moving objects
NEXT STEPS
  • Research the effects of centrifugal force on particle motion
  • Explore the principles of fluid dynamics related to viscosity and adhesion
  • Study the role of air friction in the dynamics of moving objects
  • Investigate the Coanda effect and its applications in fluid behavior
USEFUL FOR

Physics enthusiasts, mechanical engineers, motorcycle designers, and anyone interested in the dynamics of fluid motion and its practical implications in vehicle design.

shahzadzai
Messages
3
Reaction score
0
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.
 
Physics news on Phys.org
Hint: Newton's second law (and what you know about circular motion / centripetal forces and velocities)
 
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.
 
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:
 
Tiny-tim..clever observation!
 
Hi Naty1! :smile:

:wink: I got the idea from Newton! :wink:​
 
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.
 
Jeff Reid said:
along the sidewalls towards the center of the tire

:confused: Is that what you meant to type?
 

Similar threads

Undergrad Acceleration on an electric unicycle, how much does the rider have to lean?
  • · Replies 30 ·
2
Replies
30
Views
2K
Undergrad Direction of friction of each wheel and total moment when a car turns
  • · Replies 6 ·
Replies
6
Views
2K
High School Move in Space without mass exchange
  • · Replies 4 ·
Replies
4
Views
1K
High School Rotational Dynamics: Confused about the tension in this string pulling a mass up an incline
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Reaction torque in a traction system
  • · Replies 10 ·
Replies
10
Views
2K
Solving an Inertial Mystery: Angular Acceleration and Mud
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Question about an example in Newton's Principia
  • · Replies 1 ·
Replies
1
Views
1K
High School Calculate needed dimensions of table - Center of mass, levers etc
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad What is the direction of friction
  • · Replies 1 ·
Replies
1
Views
6K
High School Understanding air flow and resistance
  • · Replies 3 ·
Replies
3
Views
2K