Tuesday, March 23 rd Agenda

2. Tuesday, March 23rdAgenda • Finish lab calculations • Chapter 8 Jeopardy Review • Homework: • Finish Chapter 8 Study Guide • Chapter 8 crossword Puzzle • Chapter 8 Test/Study Guide Due • Thursday, March 24th!

3. Lab Calculations • To convert grams to kilograms: • Divide your number of grams by 1,000 • To convert centimeters to meters: • a. Divide your number of centimeters by 100

4. Lab Calculations • 3. To find the average time ball traveled (s): • Time ball traveled for trial #1 • Time ball traveled for trial #2 • + Time ball traveled for trial #3 • Answer • b. Divide Answer by 3 to get average time (s)

5. Lab Calculations • 4. To calculate the average speed of the ball (m/s): • Average speed = length of ramp (m) average time ball traveled (s) • To calculate final speed (m/s): a. Multiply average speed by 2 to get final speed

6. Lab Calculations • To calculate final kinetic energy (J): • a. Use the equation for kinetic energy • KE = ½ X (mass of ball) X (final speed)2 • To calculate initial potential energy (J): • a. Use the equation for potential energy • PE = (mass of ball) X (9.8 m/s2) X (ht of ramp)

7. Defending Your Conclusions • Use COMPLETE SENTENCES to answer the “Defending Your Conclusions” section of the lab. • Be sure to answer ALL PARTS of the questions, not just a Yes or No…

8. Jeopardy Teams1B • Team #1: • Team #2: • Team #3: • Team #4: • Team #5:

9. Chapter 8 Work & Energy

10. THE RULES: • There will be 5 teams • The host’s decisions are final • Each member of the winning team will receive $1 mole money

11. And now…here is the host of Jeopardy… Mrs. Elfline

12. Let’s Get Ready to play… Today’s Categories are:

13. Definitions

14. Simple Machines

15. Critical Thinking

16. Calculations

17. Word Puzzles

18. Definitions Simple Machines Critical Thinking Calculations Word Puzzles $100 $100 $100 $100 $100 FJ $200 $200 $200 $200 $200 $300 $300 $300 $300 $300 $400 $400 $400 $400 $400 $500 $500 $500 $500 $500

19. A quantity defined as force X distance Answer…

20. Work 100

21. Power is calculated by dividing work by Answer…

22. Time 200

23. The ability to do work defines Answer…

24. Energy 300

25. The sum of the kinetic and potential energy of large-scale objects in a system is called Answer…

26. Mechanical Energy 400

27. The ratio of useful work output to work input is a measure of Answer…

28. Efficiency 500

29. What are the 2 families of simple machines? Answer…

30. Lever and Inclined Plane 100

31. Levers are divided into how many classes based on the location of the fulcrum? Answer…

32. 3 200

33. Where is the fulcrum in a 1st class lever? Answer…

34. In the middle of the rigid arm. 300

35. What is the mechanical advantage of a single, fixed pulley? Answer…

36. 1 400

37. What class of lever is a bicep muscle? Answer…

38. 3rd class 500

39. A boy pushes on a parked car with a force of 200 N but the car does not move. How much work does the boy do on the car? Answer…

40. 0(No work is done unless the object moves) 100

41. A quantity that measures how much a machine multiplies force or distance is called Answer…

42. Mechanical Advantage 200

43. What is the ability to do work called? Answer…

44. Energy 300

45. Gravitational potential energy depends on the:a. Mass of the objectb. Height of the objectc. Acceleration due to gravityd. All of the above Answer…

46. d. All of the above 400

47. What is the primary source of the sun’s energy? Answer…

48. Nuclear Fusion 500

49. A boy uses a force of 65 N when he lifts a box 1.2 meters. How much work does he do? Answer…

50. 78 J 100