Final answer:
A wheel and axle is the simple machine consisting of two cylinders with different radii, operating like a lever with a rotatable effort arm, and its IMA is calculated by dividing the radii of the wheel over the axle.
Step-by-step explanation:
The simple machine that consists of two disks or cylinders, each with a different radius, is known as a wheel and axle. This device operates much like a lever but with the difference being that the effort arm can rotate around the fulcrum, which is at the axle's center. When force is applied to the rim of the larger wheel, it causes a greater force to be exerted on the rope wrapped around the smaller axle. To determine the ideal mechanical advantage (IMA) of this simple machine, one would divide the radius of the wheel by the radius of the axle. Examples of this simple machine include crank-operated devices.