Help me understand static and kinetic friction please

Hi, I understand that the static coefficient of friction dictates how much force is required to initiate motion/slippage and kinetic(dynamic) coefficient of friction dictates how much force is required to maintain motion/slippage. So considering a clutch with a friction and drive plate, what is dictating the rigid coupling when the there is no slippage it is transferring all the torque from the engine to the gearbox ?In summary, the static coefficient of friction determines the maximum torque capacity of a clutch when there is no slippage, as it is responsible for initiating motion and maintaining it. This can be calculated using the uniform pressure theory, with the maximum torque capacity being determined by the coefficient of friction and clamping force.
  • #1
knight92
101
0
Hi, I understand that the static coefficient of friction dictates how much force is required to initiate motion/slippage and kinetic(dynamic) coefficient of friction dictates how much force is required to maintain motion/slippage. So considering a clutch with a friction and drive plate, what is dictating the rigid coupling when the there is no slippage it is transferring all the torque from the engine to the gearbox ?

Using uniform pressure theory the clutch's maximum torque capacity is:

T = (2/3)*u*N*Radius Gyration

where

u = coefficient of friction
N = Clamping force

If the car is in gear with clutch fully engaged (no slippage) then in this case the maximum torque capacity will be determined by the static or kinetic coefficient of friction?

Thank you.
 
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  • #2
If the clutch isn't slipping, it's the coefficient of static friction that determines the maximum torque.

Chet
 

Related to Help me understand static and kinetic friction please

1. What is static friction?

Static friction is the force that resists the motion of an object when it is at rest. It is the force that must be overcome in order for an object to start moving.

2. What is kinetic friction?

Kinetic friction is the force that resists the motion of an object when it is already in motion. It is the force that acts against the direction of motion and slows down the object.

3. How do static and kinetic friction differ?

The main difference between static and kinetic friction is that static friction acts on objects at rest, while kinetic friction acts on objects in motion. Additionally, static friction is typically greater than kinetic friction, meaning it requires more force to overcome.

4. What factors affect the amount of friction?

The amount of friction between two surfaces is affected by several factors, including the roughness of the surfaces, the force pressing the surfaces together, and the type of material the surfaces are made of. In general, rougher surfaces and higher forces will result in more friction.

5. How is friction beneficial?

While friction is often seen as a hindrance, it is actually essential for many everyday activities. For example, without friction, we would not be able to walk, drive, or even hold objects. Friction also helps to prevent objects from slipping or sliding, making it an important factor in safety and stability.

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