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Motion

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Motion

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  1. Motion

  2. Warm-up 1/24/14 • Teach the Teacher: Broncos or Seahawks for the Superbowl (or I hope that it snows and no one gets to play) • Review: What is a good and bad thing about nuclear power.

  3. Warm-up 1/27/14 • Teach the Teacher: What are good board games/card games? • Review: Anything that nuclear power might do in the future?

  4. Warm-up 1/29/13 • Teach the Teacher: What is the best mode of transportation besides a car? • Review: What is Powertech?

  5. Warm-up 1/30/14 • Teach the Sub: Would you rather have a third leg or a third arm? • Review: What did we study in Physical Science 1 (last semester).

  6. Warm-up 2/3/14 • Teach the Teacher: What was the best Super Bowl commercial? • Review: On a scale from 1-10 (1-easy, 10-hard) how hard was it to argue for a different side then what you did your uranium mining paper?

  7. Physics To Win It! Modeled off of Minute to Win It Your Chance to Win…. AND LEARN PHYSICS

  8. Warm-up 2/4/14 • Teach the Teacher: Which movie could you watch over and over again? • Review: What can you tell me about cm, mm, and inches?

  9. Every Change that Occurs Requires Energy!

  10. By the End you should be able to answer these questions on Motion and Physics • How can you tell when motion happens? • What things describe motion? • How do you calculate speed and acceleration? • How can I create a “picture” of motion?

  11. Physics: The part of science that deals with: • matter, • energy, • space, • time, and • the relationship between them • People who study this: Physicists • What is Physics Cheesy: http://www.youtube.com/watch?v=nvTNE1FdmKc • Big Bang Theory: http://www.youtube.com/watch?v=AEIn3T6nDAo

  12. What Physicists Do.. • Physicists have jobs in: • Space travel and research • Technology-video games and devices • Transport-airplanes, cars, sea travel • Medical-x-rays, nuclear therapies, etc. • Music & Television • Buildings • Environmental conservation and design • http://www.nsf.gov/news/special_reports/olympics/bobsled.jsp

  13. To do These Cool Things They Must Know…(crawling before jumping) • What physics is and can list different ways in which it will be used.  • that every change that occurs requires energy. • How to measure changes. • how to measure distance and displacement using mm, cm, and m and how to convert between them and US measurements.  • How to convert time between seconds, minutes, and hours.  • a change in position is motion and you need a reference point to determine whether you have motion or not.   • How to describe motion using velocity, acceleration.  • the difference between units and symbols (variables).  • to calculate velocity (speed) and acceleration and what they mean.  • How to graph (draw a picture) of velocity and acceleration to show when there is a change in energy and when there is not. • set up a graph for the motion of a moving object.

  14. Standards of Measurement • Legend has it that the length of a “foot” used by ancient Greeks was actually Hercules foot length. • But accurate measurement is needed in a valid experiment. • Standard—an exact quantity that people agree to use for comparison. • In order for a measurement to make sense, it must include a number AND a unit. • Examples: 150ft, 35cm, 64 mi

  15. NO NAKED NUMBERS!! ALL NUMBERS MUST HAVE A UNIT BEHIND IT!!

  16. Measurement Systems • US: English system • Most other nations: metric system • Science Worldwide: an improved version of the metric system called “International System of Units” or SI units. • SI comes from the French Le SystemeInternationaled’Unites • We use the SI system because it is easier to convert units and share with others around the world.

  17. The SI System • SI Measurements and Base units • The unit for length is the meter (m) • The unit for massis the gram (kg) • The unit for time is the second (s)

  18. The SI System • The SI system is based on the number 10. • Prefixes are used with the names of the units to indicate which multiple of 10 should be used with the units. • Prefix meaning Example_________ • kilo= 1000 1 kilometer = 1000 meters • deci= 1/10 or 0.11 decigram = 0.1 grams • centi= 1/100 or 0.01 1 centimeter = 0.01meters • milli= 1/1000 or 0.001 1 millisecond = 0.001 secs • micro = 1/1,000,0001 micrometer = 0.000001 m

  19. Converting Units • Sometimes things need to be converted to different units. • You can use a conversion factor (a ratio) to change one unit to another. • Ex. 1 in = 2.54 cm • This process is called dimensional analysis

  20. Conversion Process How many centimeters is 6.74 in? • Start with the given • Find the conversion factor and put the given unit on the bottom. 1 in = 2.54 cm • Cross out units that cancel and multiply or divide • Write the correct answer and units

  21. Warm-up 2/5/14 • Teach the Teacher: Should we teach emotional well being (how to deal with stress, deal with criticism, deal with anger, etc.) in schools? • Review: What should all measurements (#’s) have after them in physics (no naked numbers!)

  22. White Board Challenge • Yay or Nay • Is meters for length?

  23. White Board Challenge • Yay or Nay • Is kilograms (kg) for mass (kinda like weight)?

  24. White Board Challenge • Yay or Nay • Is grams (g) for time?

  25. White Board Challenge • Yay or Ney • Is hours (h) for time?

  26. White Board Challenge • Yay or Ney • Is millimeters for length?

  27. White Board Challenge • Yay or Ney • Is seconds for measuring mass (kinda like weight)?

  28. White Board Challenge • If we have 32 kg of puppies how many grams is that? • Given:___ • Conversion Factor:____

  29. Whiteboard Challenge • If we had 900 mm of foot-by-the-foot (strawberry) how many cm would that be? • Given:___ • Conversion Factor:____

  30. Whiteboard Challenge • If we had 3 yards of a gummy worm how many meters (m) would that be? • Given:___ • Conversion Factor:____

  31. Warm-up 2/6/14 • Teach the Teacher: If you could write yourself a note what would it say? • Review: What do grams measure (length, mass, time)?

  32. Flash Card • On the front: • Physics • On the back: • Science that studies matter, energy, space, time, and the relationship between them.

  33. Physics Matter! • http://www.nsf.gov/news/special_reports/olympics/bobsled.jsp

  34. Flash Card • On the front write: • Motion • On the back write: • a change of position of an object.

  35. What is Motion? • Motion occurs when an object changes position. • You don’t need to see something move to know that motion has taken place. • You just need a reference point (starting point) to know if motion occurred

  36. Ways to Describe Your Motion • Distance Traveled • Displacement • Your speed (velocity) • Your acceleration

  37. Distance and Displacement • Distance—how far an object moved • The SI unit for distance is the meter, m • Displacement—the distance and direction of an object’s change in position from the starting point. • If you get lost, your distance traveled and the your displacement could be very frustrating!

  38. Describing Motion: What is Speed? • Rate—any change over time • Speed—the distance an object travels per unit of time. fastest

  39. Calculating Speed • The speed of an object can be calculated from this equation: • Speed = Distance Time • S =D/T • When working equations • Write the formula • Plug in the values for each known variable • Calculate the answer • Write the answer and a unit

  40. Average & Instantaneous Speed • Average speed—the total distance traveled divided by the total time of travel. • Used when speed is changing • Instantaneous speed—the speed at a given point in time. • Ex. Speedometer • Units: m/s (mph)

  41. Velocity • Speed describes only how fast something is moving. • Velocity—includes the speed of an object AND the direction of its motion • Units: m/s

  42. Change in Velocity • Velocity can change in 2 ways • Change in speed • Change in direction Or Both • Ex: a race car has a constant speed of 100km/hr around an oval track. • Speed is constant, but velocity changes

  43. Describing Motion: Acceleration • Acceleration—the rate of change of velocity. • The change in velocity over time • acceleration = change in velocity time • When something speeds up, it has a positive acceleration • When something slows down, it has a negative acceleration.

  44. Breaking Acceleration Apart • V=d/t • Vf= velocity final, Vi= velocity initial (starting) • Change in velocity= vfinal–VInitial • Acceleration= vfinal–Vinitial • Time • Units= distance (meters, miles)/sec2 • a=(Vf-Vi)/t

  45. Changing Direction • Remember: • A change in velocity can be either a change in speed or a change in direction. • Any time an object changes direction, its velocity changes and it is accelerating.

  46. Graphing Motion • On a distance vs. time graph, time goes on the x-axis and distance goes on the y-axis. • The slope (steepness) of the line represents the speed of the object. Distance  Speed Time↑

  47. Draw this on your paper! Y-axis faster slower Distance (meters) Standing still X-axis Time (seconds)

  48. Warm-up 1/23/2013 • Teach the Teacher: If you could have a life song or theme song, what song would it be (that I want to know about)? • Review: Tell me anything you can about motion.

  49. Flash Card • On the front write: • Reference Point • On the back write: • Determines an object’s position and if motion happened