[ 449 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • The mechanical advantage (MA) of a machine is a measure of how much the machine multiplies the input force applied to it. MA = Input Force Load Load Input Force The table shows the input force required to lift different loads using the pulley system shown in the illustration. Load (N) Input Force (N) 30 10 60 20 90 30 150 50 Based on the data in the table, what happens to the mechanical advantage of the pulley system as the load size increases? A. The mechanical advantage increases at a constant rate. B. The system’s mechanical advantage does not change. C. The pulley system multiplies the mechanical advantage. D. The mechanical advantage decreases at a constant rate.