Susie sings a song about inclined planes. In the song, she highlights a scenario in which they are useful: building pyramids in ancient Egypt. The song is accompanied by visuals to illustrate how an inclined plane works.
Sheldon and Leonard use the stairs as an inclined plane to decrease the force required to lift the package. This is a very clear illustration of what an inclined plane is and how it is used in our daily lives.
Bill climbs down a firepole and wants to get back up. He uses simple machines such as ramps and levers to spread out the work and make it easier to get back up. Also, Bill explains that we use ramps every day in the form of stairways.
Teacher Susie challenges her students to move the basket from the ground to the top of the slide. The students experiment with different approaches until they come to a solution. Then, they record their observations in their journals.