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Lesson 11

Lesson 11 . The Inclined Plane. Getting Started . Remember Lesson 6, friction? What did you find out about friction in lesson 6?

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Lesson 11

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  1. Lesson 11 The Inclined Plane

  2. Getting Started Remember Lesson 6, friction? • What did you find out about friction in lesson 6? • When you pulled the blocks in lesson 6, you exerted a force called the effort force to move the blocks at a constant speed. Where was the friction force? Which way did it act? • Does friction increase or decrease the amount of work needed to do a task?

  3. Getting Started Continued Think of places where you have seen ramps. • Have you ever seen a ramp used to move an object or a person onto a platform or to a higher position? If so, where? • Did the ramp have a gentle slope or a steep slope? • Why do you think a ramp was used? * A ramp is a type of inclined plane *

  4. Inquiry 11.1 Measuring Forces on a Cart on an Inclined Plane Question: What will happen to the effort required to move a cart up an inclined plane if the slope is steadily increased? Hypothesis: I believe . . . Because . . . Procedure: p.102-103

  5. Data

  6. Data Continued • Make a graph showing the relationship of slope to effort force.

  7. Vocabulary • Effort distance • Load force • Load distance • Gravity

  8. Conclusion • Look back at your original question. • Write in complete sentences. • Use and underline all vocabulary terms.

  9. Inquiry 11.2Measuring Work on a Cart on an Inclined Plane Question: How does the work needed to pull the cart up the inclined plane set at different slopes compare with the work needed to lift the cart straight up? Hypothesis: I believe . . . Because . . . Procedure: p. 104-105

  10. Data: Work and the Inclined Plane Load Force___________ x Load Distance ____________ = ___________ (work)

  11. Data Questions • On the basis of the results of these inquiries, how would you define a machine? • In you view, is an inclined plane a machine? • Why are ramps for people with physical disabilities long and gently sloping, rather than short and steep? • Suppose you repeated inquiry 11.2 with a sled instead of a cart. Would you get different results? If so, how would they be different?

  12. Vocabulary • Load distance • Load force • Effort distance • work

  13. Conclusion • Look back at your original question. • Write in complete sentences. • Use and underline all vocabulary terms.

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