What changes when an axle turns a wheel, meaning: A. Does it change directionB. Multiply distance(which decreases the effort)C. Multiplying effort (decreasing distance)and what are some examples of it?
The answer is B. The axle has a small radius, the wheel a large radius. The effort available at the circumference of the wheel is less than the effort at the circumference of the axle, by the ratio of their radii lengths. e.g. If axle radius is 20cm., and a torque of 20N/metre is applied at that distance, and wheel radius is 100cm., the force available at the wheel's circumference will be (20/100) 1/5th., or 4N/metre.
May 28, 2018