Teacher Edition

GO ONLINE GO ONLINE Read About: Energy and Speed INTERACTIVE PRESENTATION 1 3 2 EXPLORE NGAGE EXPLORE EXPLAIN ELABORATE EVALUATE Energy and Speed 30 min whole class Visual Literacy Label a Diagram Have students study the diagram of the roller coaster. Tell students that numbers are often included in a diagram to show where something is occurring at a given time. ASK: What forces and energies does the diagram show? Sample answer: A motor pulls the cars to the top of the hill, and they gain potential energy as they move toward the peak. When the cars are motionless at the top, they have only potential energy. As they move down the hill, the potential energy changes into kinetic energy. 4. ENGINEERING Connection Discuss with students how roller coasters have changed over time. Explain how advances in technology have allowed mechanical engineers to design faster and taller roller coaster rides. For example, replacing wood wheels with metal wheels, and then with polyurethane wheels to make for a smoother ride. ASK: Recall what you learned about friction and air resistance in Lesson 1. How do friction and air resistance affect how fast a roller coaster moves along the tracks? Sample answer: Friction and air resistance would decrease the speed of a roller coaster moving on its track. Energy and Speed 1 3 2 Label a Diagram: Speed and Energy of a Roller Coaster Write captions for each number on the diagram. Describe the speed, potential energy, and kinetic energy at each point on the roller coaster track. 1. 2. 3. Sample answer: The cars gain potential energy as they are pulled to the top of the first hill. Sample answer: As the cars go down the hill, the potential energy decreases. The kinetic energy increases as the cars gain speed. Sample answer: At the end of the ride, the cars are moving slowly; they have little kinetic energy and potential energy as they come to a stop. Copyright © McGraw-Hill Education 32 EXPLAIN Module: Forces and Motion 023_040_NA_SCI_SE_G4_MAL2U1_699632.indd 32 22/12/18 4:28 PM Lesson 2: Speed and Energy Differentiated Instruction AL Have students work in pairs to draw an object with potential energy and an object with kinetic energy. Have students share and discuss their examples. OL Have students flip a coin. Heads is potential energy. Tails is kinetic energy. When a student flips the coin, he or she will provide an example of the determined energy type. BL Have students write a short paragraph explaining the roles of potential and kinetic energy in the way a hammer works. 32 Module: Energy and Motion