The screw and the Wheel @ Axle!!!

By doing this experiment online I learned that the wheel and axle makes work easier. When you lift a block vertically you can use a wheel and axle. The two things that I noticed that made a difference in the Mechanical Advantage is the radius of the wheel and the number of threads per meter. When the wheel had a large radius, and the screw had a denser number of threads the mechanical advantage would be higher. If a machine was efficient the Mechanical advantage would be high, if it is efficient, the less work you would have to produce.