dl09

i am planning to build a robotic toy car. if i punch a hole in a bottle cap and insert the shaft of the electric motor in the hole, then the lever arm is the radius of the electric motor shaft?

so the radius of the axle is the lever arm? just trying to make sure i understand the post.

let's say we have an electric car. the electric motor turns the wheels. there is a torque. torque is force times lever arm. is the distance from the center of the wheel to the edge of the wheel, the lever arm? if not, then where is the lever arm?