Machines help make work easier for us, hence the word "simple". There are six simple machines. Levers are long pieces of material that form a see-saw to help us lift objects. A pulley is basically a wheel that has a rope going over it to help reduce the weight of lifting something. A ramp is an inclined plane. Inclined planes allow us to move things up vertically slower and requiring a little less force. When you smack two inclined planes together in the opposite direction you get a wedge. Wedges can be used to separate and hold things in place. Second only to fire, the wheel and axle allows us to transport things long distances. Screws are meant for holding things together they also can be used to open up areas.
The worksheet set starts by having students understand to identify various simple machines. We then advanced to identify how these tools are embedded in a more complex machine like a bicycle. We finish by having students quantify the advantage that simple machines give us.