For additional resources and support on mechanical advantage and efficiency, check out the following:
Efficiency measures how much of the work put into a machine is actually converted into useful output work. No machine is 100% efficient because some energy is always lost as heat due to friction.
Most worksheets and PDF answer keys for Section 14.3 focus on these types of problems:
As she poured over the formulas and diagrams, Emily noticed a peculiar pattern. The equations seemed to be pointing to a specific combination of mechanical advantage and efficiency values. She quickly calculated the values, and to her surprise, they matched the cryptic message.
If you are creating this answer key yourself, be sure to include the three core formulas prominently at the top: