Dorothy Ann then shows him a page of the baseball field and tells him that it would be impossible to play normal baseball there. But when Ralphie rubs his bat against the dirt, he changes his mind and gains interest in the book. The students, however, are more than apathetic of this and continue their game. The sled would continue to move until something stops it, such as dirt, thus creating friction, which slows down and stops every motion on earth. Dorothy Ann then uses an analogy and tells them to picture a big, red sled in a snow that is stationary until someone hops onto it and Napoleon (as Arnold states since he needs to know who pushes the sled to refresh his memory) gives it a push to elicit its motion, thus creating a force. During the conversation, the students continue to mock Dorothy Ann's affinity for physics, telling her that if she's going to "force" them to listen, she's being kind of "pushy". Frizzle overhears the students' conversation and decides to implement a field trip. But Dorothy Ann explains that the book is about what makes things move and what makes them stop: forces frictions, pushes, and pulls. Ralphie attempts to shoo Dorothy Ann off the field. As Liz runs into the classroom's window, Dorothy Ann tells the other students about her book and the others scoff at this. But the game is interrupted by Dorothy Ann, who shows them a book of physics. Wanda is on the pitcher's mound and pitches the ball to Ralphie. He is next to bat at the batting cage at the park with the other students and notices that there is no home plate, for the students are pretending. Just then, Keesha's voice is heard, and Ralphie is revealed to have fantasized the whole scenario.
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