B Axle stress

Summary
How much stress is put on an axle based on weight of a car and radius and width of a wheel.
If I were to have a theoretical car with 4 motors controlling the 4 wheels(each with a radius of 5 in and a width of 1 in) and the car was 100 pounds, how much stress would be exerted back on to each motor?
 

Nugatory

Mentor
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Stress, torque, and force are different things and it’s not clear which one you are asking about.
However, no matter which you mean, the answer will depend on some other things you haven’t told us yet, beginning with whether the car is sitting still (no torque), coasting at a constant speed (just enough torque to create a force that overcomes the forces of air resistance and friction), or accelerating/decelerating. Once the torque is known, the forces at various points in the drivetrain can be calculated, and the stresses can be estimated (roughly if we make some simplifying assumptions, more accurately with a lot more work) from that.

This is all a long-winded way of saying that you’ll have to tell us a lot more about why you’re asking and what you’re trying to do before we can give you helpful answers.
 

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