Simple and Compound Machines

Today we learned about different machine groups. The first group is simple machines. It consists of levers, pulleys, wheel and axel (all 3 are in the lever family), wedge, ramp, and finally, screws (are in the inclined plane family). Many machines we use today consists of more than one simple machines. Such as a sterring wheel. These machines are what we call compound machines. Without simple machines, we wouldn't have anything that we do today.