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Lesson 6

Lesson 6. The Force of Friction. Getting Started. Discuss what you know about friction with your lab partner. In your notebook, identify one situation in which friction works for you. Identify one situation in which friction works against you.

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Lesson 6

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  1. Lesson 6 The Force of Friction

  2. Getting Started • Discuss what you know about friction with your lab partner. • In your notebook, identify one situation in which friction works for you. • Identify one situation in which friction works against you.

  3. Question: How does surface type affect friction? Hypothesis: I believe . . . Because. . . Procedure: p. 50-51 Inquiry 6.1 Pulling a Block Across Different Surfaces

  4. Data:Force Needed to Move a Block 27 cm Over Different Surfaces

  5. Data Questions • Make a graph of your data table. (Bar Graph) • Which surface required the greatest force to pull the wooden block across it? • Which surface required the least force? • Did the weight of your wooden block change as the surfaces changes? • Review the variables for this lesson. Which variables did not change as you tested each surface?

  6. Inquiry 6.2Changing the Load • Discuss with your partner the following question: What will happen to the effort force needed to pull the block if you change the weight of the block? • Write your prediction in your notebook.

  7. Question: How does weight affect friction? • Hypothesis: I believe . . . Because. . .

  8. Procedure • Procedure: p. 51-52 • You will work in teams of two • Complete the inquiry by stacking up to 4 blocks on the original block. • Decide what units to use when measuring the weight of each block: Newtons or blocks.

  9. Data:

  10. Data Questions • Share your results with the class. • Graph the data.

  11. Inquiry 6.3Changing the Surface Area • Question: How does surface area affect friction? • Hypothesis: I believe. . . Because. . . • Procedure: p. 52-53

  12. Data: Changing the Surface Area

  13. Data Questions: 1. What have your learned about friction in this lesson? In your notebook, summarize in several paragraphs what you have learned about the force of friction. In your summary include factors that affect friction force and explain how you measure it.

  14. 2. In this lesson you measured sliding friction. Why does the force on the spring scale measure the force of friction while the block moves at a steady speed?

  15. 3. Suppose you used ice as a surface for the block to slide on. What results would you get in this lab? Consider results for the two variables – surface area, weight of the block.

  16. Vocabulary: • Sliding friction • Frictional force • Inertia • Static friction

  17. Conclusion: • Write in complete sentences. • Use and underline all vocabulary terms.

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