Wheel overcome obstacle at speed.

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Discussion Overview

The discussion revolves around the calculation of forces and torques acting on a wheel overcoming an obstacle at a specified speed. Participants explore concepts related to normal forces, work, and the dynamics of the wheel in relation to its mass, dimensions, and tire properties.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant seeks to calculate the reaction forces on a tire when it encounters an obstacle, providing specific parameters such as velocity, mass, radius, and obstacle height.
  • Another participant questions whether the normal force does any work in this context.
  • A further contribution suggests that the normal force acts vertically to lift the wheel while also implying it contributes to the loss of kinetic energy along the horizontal axis.
  • There is a query about the relationship between force and work, indicating a potential exploration of fundamental physics concepts.

Areas of Agreement / Disagreement

Participants appear to have differing views on the role of the normal force and its relationship to work, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the forces involved, the definitions of work in this context, and the specific calculations required to determine the forces acting on the wheel.

Pacx
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Hi there, I have a project of torsion bar. I need to know value of force is making a torque on it.

So I have a velocity V=40km/h, mass per wheel m=530kg, radius of wheel R=290 mm and heigh of obstacle h = 6 cm. What will be the reaction N, on both axis, of obstacle to tire? I have no idea how to calculate that.

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Also, tire pressure is p = 0,2 MPa, tire stiffnes k = 150 000 N/m and tire supression is c= 150 Ns/m as tire will absorb some of impact force, but what value of force won;t be absorbed?
 
Last edited:
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Does the normal force do any work?
 
At axis Y it lifts wheel and axis X it is responsible for loosing some kinetic energy.
 
Is that a "yes"?
Do you know a relationship between force and work?
 

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