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10 points 1 point per problem! Write the FULL Q&A, or reword it in your answer !!!

10 points 1 point per problem! Write the FULL Q&A, or reword it in your answer !!!. 10 points 1 point per problem! Write the FULL Q&A, or reword it in your answer !!!. Do Now Extension:. What did you learn from the DO NOW that will help you when you start driving?

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10 points 1 point per problem! Write the FULL Q&A, or reword it in your answer !!!

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  1. 10 points 1 point per problem! Write the FULL Q&A, or reword it in your answer !!!

  2. 10 points 1 point per problem! Write the FULL Q&A, or reword it in your answer !!!

  3. Do Now Extension: • What did you learn from the DO NOW that will help you when you start driving? • You're driving on Pond Road (25 mph). Then, you drive on 195 (65 mph). On which road should you leave more STOPPING DISTANCE between you and the car in front of you? Why?

  4. Goals for Today • Check your HW!!! • Check the book HW using clickers • #1-13, 21-23 p.119 • #1-7 p. 672 • IN GROUPS: • Check the guided notes up to the boxed questions • Need help? ASK! • Complete the ***Boxed Questions on last week’s notes***

  5. Take out your book HW • #1-4 • #5, 21-23 • #6-13 (^^^ all from page 119 ^^^) • And p. 672, #1-7 (last night’s HW – you just got this back) ***Unless otherwise stated, assume NO: • Friction • Air resistance • Sound • Etc.

  6. 1. What do we call the quantity force times distance, and what quantity can it change? • Work, energy • Work, power • Momentum, energy • Momentum, work 10 Countdown

  7. 2. Work is required to lift a barbell. How many more times work is required to lift the same barbell 3 times as high? • Half as much • Twice as much • Three times as much • Nine times as much 10 Countdown

  8. 3. Which requires more work: lifting a 10 kg mass a vertical distance of 2m, or lifting a 5kg mass a vertical distance of 4m? • lifting 10 kg a vertical distance of 2m • lifting 5kg a vertical distance of 4m • same work in both cases 10 Countdown

  9. Check Question! Calculate the ACTUAL work done in lifting… • a 10 kg mass a vertical distance of 2m • a 5kg mass a vertical distance of 4m CAREFUL! W = ΔE Fd= Δ(mgh) Are you given the FORCE (weight), or the MASS? Which equation pertains to this problem?

  10. Check Question! Calculate the ACTUAL work done in lifting… - a 10 kg mass a vertical distance of 2m - a 5kg mass a vertical distance of 4m**They are the same answer** • 20 Joules • 20 Watt • 200 Joules • 200 Watts 10 Countdown

  11. 4. How much work is done on an object when a force of 10N pushes it a distance of 10m? • 1 Joule • 1 Watt • 100 Joules • 100 Watts 10 Countdown

  12. 5a. How much power is required to do 100J of work on an object in 1 second? • 1 Joule • 1 Watt • 100 Joules • 100 Watts 10 Countdown

  13. 5b. How much power is required to do 100J of work on an object in 0.5 second? • 50 J • 50 W • 200 J • 200 W 10 Countdown

  14. IMPORTANT INFO! If you have a scenario with the… • SAME work… • But HALF the time… • Then there is TWICEthe power!!!

  15. Consider this analogy… 1996 Dodge Neon (my 1st car!) vs. 2014 Corvette Stingray • Which can go from 0-60 mph in LESS time? • Which is more powerful?

  16. IMPORTANT INFO! If you have a scenario with the… • SAME work… • But HALF the time… • Then there is TWICEthe power!!!

  17. Check Question!!!Work and Power are __proportional • Directly • Inversely • I have no idea 10 Countdown

  18. Check Question!!!Time and Power are ___ proportional • Directly • Inversely • I have no idea 10 Countdown

  19. POPCORN! 6. What are the 2 main forms of Mechanical Energy? (1 person will give one, and a 2nd person will give the other)

  20. 7a. If you do 100 J of work to elevate a bucket of water, what is its grav. PE relative to its starting point? • More than 100 J • Less than 100 J • 100 J • Zero 10 Countdown

  21. 7b. If you lift it 2x as high, what’s its PE? • Less than 100 J • 100 J • More than 100 J, but less than 200 J • 200 J • More than 200 J • Zero 10 Countdown

  22. Check Question!!!Grav. PE and Heightare ___ proportional • Directly • Inversely • I have no idea 10 Countdown

  23. 8. A boulder is raised above the ground so that its grav. PE is 200 J (relative to the ground). Then it’s dropped. What’s its KE the INSTANT just before hitting the ground? • More than 200 J • Less than 200 J • 200 J • Zero 10 Countdown

  24. CHECK QUESTIONA boulder is raised above the ground so that its grav. PE is 200 J (relative to the ground). Then it’s dropped. What’s its KE the INSTANT just before hitting the ground if there IS air resistance? • More than 200 J • Less than 200 J • 200 J • Zero 10 Countdown

  25. 9a. Suppose an automobile has 2000 J of kinetic energy. When it moves a twice the speed, what will be its kinetic energy? • The same (2000 J) • 2x as much (4000 J) • 3x as much (6000 J) • 4x as much (8000 J) • 6x as much (12,000 J) • 9x as much (18,000 J) 10 Countdown

  26. 9b. Suppose an automobile has 2000 J of kinetic energy. What’s its kinetic energy at three times the speed? • The same (2000 J) • 2x as much (4000 J) • 3x as much (6000 J) • 4x as much (8000 J) • 6x as much (12,000 J) • 9x as much (18,000 J) 10 Countdown

  27. KEis directly proportional to the SQUARE of the velocity!

  28. 10. What will be the kinetic energy of an arrow having a potential energy of 50 J after it is shot from a bow? • The same (50 J) • More than 50 J • Less than 50 J 10 Countdown

  29. POPCORN 11. What does it mean to say that in any system the total energy score stays the same?

  30. POPCORN 11. What does it mean to say that in any system the total energy score stays the same? Energy is conserved.

  31. POPCORN 12. In what sense is energy from coal actually solar energy?

  32. POPCORN 12. In what sense is energy from coal actually solar energy? LONG ANSWER: Coal is formed from organic material. Organic materials (plants, the animals that eat plants, and the animals that eat animals that eat plants) get their energy from the sun. SHORT ANSWER: Coal is made from tiny dead organisms that needed the sun to be alive at one time.

  33. POPCORN 13. How does the amount of work done on an automobile by its engine relate to the energy content of the gasoline?

  34. POPCORN 13. How does the amount of work done on an automobile by its engine relate to the energy content of the gasoline? It is less than the energy contained in the gasoline. An automobile engine is not 100% efficient. (Some of the gas energy powers the car…but some is transferred into heat, sound, etc… TOTAL ENERGY stays the same, but that sum is made of diff. types of Potential and Kinetic energy!)

  35. ANSWERS ONLY Which doesn’t help you if you don’t know HOW to fix/complete the problem!!! Check your work… get help from a peer or teacher if needed!!! PAGE 119-120 70 J Work = 1100 J; PE = 1100 J 550 W PAGE 672 500 J 150 J 150 J 50 W 80 J 420 J 420 J When done… Please review the 8.3 – 8.6 GUIDED NOTES from last week (w/ the sand) in groups (check your work / solutions!) Then, complete the BOXED QUESTIONS in those notes. I will not be checking/collecting, but this is a study tool for your test!

  36. CHECK QUESTIONS! • This is our exit. • When done, return your clicker!

  37. Can energy ever be created? • Yes • No • Sometimes 10 Countdown

  38. Can energy ever be destroyed? • Yes • No • Sometimes 10 Countdown

  39. Does an object with momentum always have energy? • Yes • No 10 Countdown

  40. Does an object with energy always have momentum? • Yes • No 10 Countdown

  41. If a mouse and an elephant both run with the same kinetic energy, can you say which is running faster? • The mouse • the elephant • Not enough info to say 10 Countdown

  42. Is it possible for an object to have BOTH PE & KE(simultaneously)? • Yes • No • Not enough info to say 10 Countdown

  43. Return your clickers…don’t forget tonight’s HW! 10 points 1 point per problem! Write the FULL Q&A, or reword it in your answer !!!

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