Simple Machines. There are 6 basic simple machines. Simple machine do not decrease the amount of work we must do, they make the work easier by decreasing the amount of force we must apply. W I nput = W Output. Hence, F input d input = F output d output
(a) A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?
(b) If you pushed down with 20 N of force over a distance of 0.80 m how much work did you accomplish?
(c) How high was the box raised?
(d) What is the mass of the box?
A broom with an input arm length of 0.4 meters has a mechanical advantage of 0.5. What is the length of the output arm?