# Wheel overcome obstacle at speed.

1. May 17, 2014

### Pacx

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.

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: May 17, 2014
2. May 17, 2014

### Simon Bridge

Does the normal force do any work?

3. May 18, 2014

### Pacx

At axis Y it lifts wheel and axis X it is responsible for loosing some kinetic energy.

4. May 18, 2014

### Simon Bridge

Is that a "yes"?
Do you know a relationship between force and work?