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Evaluating Vehicle Design: Looking at Friction

Lesson Eight:. Evaluating Vehicle Design: Looking at Friction. Think and Wonder. Do you know what friction is? How will friction affect the motion of your vehicle? In this lesson, you will take a look at specific design features that reduce or increase friction on your axle-driven vehicle.

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Evaluating Vehicle Design: Looking at Friction

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  1. Lesson Eight: Evaluating Vehicle Design: Looking at Friction

  2. Think and Wonder Do you know what friction is? How will friction affect the motion of your vehicle? In this lesson, you will take a look at specific design features that reduce or increase friction on your axle-driven vehicle. o Friction

  3. Link to LRB Materials Manager: EVERYONE MUST wear safety goggles whenever working with rubber bands. • Safety goggles for each team member • LRBs • Pencils • Copy of Record Sheet 8-A: Evaluating Our Vehicle Design for Friction • 1 standard vehicle with rubber bands attached • 1 timer o

  4. Link to LRB Explore… Turn the vehicle on its side, as show in Figure 8-1. Hold the gray bar. With one hand, spin the large wheel. What do you observe? 0

  5. Sharing ideas… Rub your hands together. What happens? We will evaluate your vehicle designs to determine the various effects friction has on their motion. 0

  6. Names: Record Sheet 8-A Evaluating Our Vehicle Design for Friction Observation Card One • Design Feature: Wheels and Tan Hub Connectors • Observations Ideas for observations: What is the job of the tan hub connector? Turn the vehicle on its side and hold the gray rod. Spin the large wheel. Time how long it spins. Do this several times. Now remove the large wheel and its tan hub connector. Turn the wheel over, Put it back on the axle so the small hole on the wheel faces out. Put the tan hub connector on the outside of the wheel. (Connect it to the small hole of the wheel.) Now spin the wheel again. Time its spin. What do you observe? How did the wheel spin differently each time? Why do you think this happened? (Remember to return the tan hub connector to the inside of the wheel when you are finished.) 0

  7. Names: Record Sheet 8-A Evaluating Our Vehicle Design for Friction Observation Card Two • Design Feature: Tires • Observations Ideas for observations: Remove the black tires from the large wheels. Use the rubber band to move the vehicle without its tires. What do you observe? What do you think is the job of the tires? (Remember to put the tires on again when you are finished.) 0

  8. Names: Record Sheet 8-A Evaluating Our Vehicle Design for Friction Observation Card Three • Design Feature: Frame and Crossbars • Observations Ideas for observations: Remove the two blue crossbars. Squeeze the frame gently. Then pull the gray bars out gently. Now try to use the rubber band to move the vehicle. What changes do you observe when you remove the crossbars? What do you think is the job of the crossbars? How can the frame without the crossbars affect the spinning wheels? (Remember to put the crossbars on again when you are finished.) 0

  9. Materials Manager: Return the timer, the goggles, and the rubber bands to the Distribution Center. 0

  10. Link to LRB Final Activities: • If there anything on your vehicle that rubs together? • What can this rubbing do to the motion of your vehicle? • What vehicle design features help reduce the amount of rubbing between the wheels and the vehicle’s axle and frame? • What vehicle design features increase the friction between the floor or work surface and the wheels? • How does this rubbing influence your vehicle’s motion? 0

  11. Do not disassemble your standard vehicle. • Materials Manager: return the materials to the Distribution Center. 0

  12. Link to LRB Update your Table of Contents 0

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