Work, Power, and Energy Simple Machines Chapter 10 Pages 257-273 I CAN: Discuss and analyze the relationship between work, power, and energy and apply.

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Presentation transcript:

Work, Power, and Energy Simple Machines Chapter 10 Pages I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Section 1 – p.257 Work and Energy ▫On page 258, define work, energy, kinetic energy, and the work-energy theorem.  Work is based on net force and displacement (not distance) ▫Write the three equations on pages ▫What if work is exerted at an angle?  Figure 10-3 “…, the net force doing the work is the component (F x or F y ) that acts in the direction of the displacement.”  If work is done at an angle, the formula will usually be Fdcos Θ (on p.260) I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Practice p.261 # a. 2.9 x 10^4 J b. 5.8 x 10^4 J 3. a. 6.0 x 10^2 J b. 5.9 x 10^3 J c. 5.9 x 10^3 J I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Practice p.262 # x 10^3 J 6. a. 903 J b J x 10^3 J 8. a. 6.9 x 10^3 J b x 10^4 J I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Power – p Define power and write the equation. 1.Power is also equal to Fv 2.How is power measured? 2.Practice p.264 # Due now – 10.1 section review (all) I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Section 2 – p.266 P ▫Define machine, effort force, resistance force, mechanical advantage, ideal mechanical advantage, and efficiency P.268 ▫What are the six simple machines? Draw each in your notes. ▫What is the difference between a simple machine and a compound machine? I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Practice p. 272 # a. 4.0 b. 1.5 c. 38% 26. a b. 91.0% m 28. a. 6.0 b. 1.7 x 10^2 N Due now: 10.2 section review (all) I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Extension Read on p.273 about The Human Walking Machine ▫Expect a short answer question… Read on p.276 about bicycle gear shifters ▫Expect a couple of short answer questions about bicycles (p ) and gear shifters I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.

Assignment Complete the worksheet about work, energy, and mechanical advantage. Engineering Problem handout I CAN: Discuss and analyze the relationship between work, power, and energy and apply this relationship to both simple and compound machines.