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Science: Motion & Design -Evaluating Vehicle Design, Looking at FRICTION -Discussion Session

Science: Motion & Design -Evaluating Vehicle Design, Looking at FRICTION -Discussion Session. Ms. Grable & Ms. Steinke’s Science Lab. Let's find out our data from lesson 7. Recorders, please measure the distance of each trial in cm. There are about 30 cm in 1 foot.

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Science: Motion & Design -Evaluating Vehicle Design, Looking at FRICTION -Discussion Session

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  1. Science: Motion & Design-Evaluating Vehicle Design, Looking at FRICTION-Discussion Session Ms. Grable & Ms. Steinke’s Science Lab

  2. Let's find out our data from lesson 7 • Recorders, please measure the distance of each trial in cm. There are about 30 cm in 1 foot.

  3. Review:When using a falling weight system, if you increase the force (by increasing the number of washers), you: A. Increase the speed of the vehicle B. Decrease the speed of the vehicle C. Do not affect the speed of the vehicle D. Affect the speed of the vehicle in an unpredictable way.

  4. Review In a falling-weight system, what force gives the push or pull needed to move the vehicle? • A. Friction • B. Gravity • C. Washers • D. String

  5. Review • A. 3,3,2,3,2 (seconds) • B. 5,6,5,5,4 (seconds) • C. 7,6,6,7,7 (seconds) • 1. A vehicle carrying a 1-block load • 2. A vehicle carrying a 2-block load • 3. A vehicle only, no load The following data (in seconds) A, B, and C were obtained from testing vehicles (with no load/load 1, 2, and 3) MATCH the correct vehicle with each set of data.

  6. Review • In order to make the vehicle move FORWARD, you would wrap the rubber band around the rear axle (the axle with the larger tires). Which way would you wrap the rubber band? • A. UNDER the axle and around • B. OVER the axle and around

  7. Learning Target “I can understand what friction is and how friction is affected by smooth and rough surfaces”

  8. Vocabulary • What is a surface?

  9. Vocabulary • Friction is the force resisting the relative motion of surfaces or material elements sliding against each other. • When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into heat. For example: rubbing pieces of wood together to start a fire. Another important consequence of many types of friction can be wear, which may lead to performance degradation and/or damage to components. (source: http://en.wikipedia.org/wiki/Friction)

  10. FRICTION

  11. Question: • Is Air Resistance Friction? • Explain why or why not

  12. Air resistance IS an example of FRICTION

  13. Question • What do you know about smooth or rough surfaces and friction?

  14. Vocabulary • Friction: What is friction? Write in your journal using pictures or words, (or both) to define friction.

  15. Today's Investigation • IN YOUR TABLE GROUPS: • Look at the standard model(s) placed on your table. • Talk about how vehicle design features can increase or decrease friction.

  16. Observation Questions • 1. Is there anything on your vehicle that rubs together? • 2. What can this rubbing do to the motion of your vehicle? • 3. What vehicle or design features help reduce the amount of rubbing between the wheels and the vehicle’s axle and frame? • 4. What vehicle design features increase the friction between the floor (or work surface) and the wheels? • 5. How does this rubbing effect your vehicle’s motion?

  17. Exit Ticket • Look • Buckets are placed in alphabetical order on the coat rack/cubby shelf • Lesson materials are folded neatly in your journals • Journals are neatly stacked at your table groups

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