If possible, try to have the students work in groups of three or four. In group work, strive to have active involvement for each member. A larger group size for this activity would not be desirable because of the small amount of actual activity to be done. If the groups were larger some students might not have an active role. Procedure Divide students into groups of three or four.
Students quickly sketch a machine on a piece of paper as it comes to mind.
Have students share their sketches with each other. Teacher models an inclined plane by driving a toy car up a lever board that has one end resting on several books. Scientists consider the inclined plane to be a machine even though it doesn t have moving parts, flashing lights, or require electricity. Teacher uses bar codes to show several examples of what we normally think of as a machine and compares the examples to an inclined plane. OR Use the video to introduce inclined planes with video clips demonstrating their uses.