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.
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?
Warm-up 1/29/13 • Teach the Teacher: What is the best mode of transportation besides a car? • Review: What is Powertech?
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).
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?
Physics To Win It! Modeled off of Minute to Win It Your Chance to Win…. AND LEARN PHYSICS
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?
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?
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
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
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.
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
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.
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)
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
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
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
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!)
White Board Challenge • Yay or Nay • Is meters for length?
White Board Challenge • Yay or Nay • Is kilograms (kg) for mass (kinda like weight)?
White Board Challenge • Yay or Nay • Is grams (g) for time?
White Board Challenge • Yay or Ney • Is hours (h) for time?
White Board Challenge • Yay or Ney • Is millimeters for length?
White Board Challenge • Yay or Ney • Is seconds for measuring mass (kinda like weight)?
White Board Challenge • If we have 32 kg of puppies how many grams is that? • Given:___ • Conversion Factor:____
Whiteboard Challenge • If we had 900 mm of foot-by-the-foot (strawberry) how many cm would that be? • Given:___ • Conversion Factor:____
Whiteboard Challenge • If we had 3 yards of a gummy worm how many meters (m) would that be? • Given:___ • Conversion Factor:____
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)?
Flash Card • On the front: • Physics • On the back: • Science that studies matter, energy, space, time, and the relationship between them.
Physics Matter! • http://www.nsf.gov/news/special_reports/olympics/bobsled.jsp
Flash Card • On the front write: • Motion • On the back write: • a change of position of an object.
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
Ways to Describe Your Motion • Distance Traveled • Displacement • Your speed (velocity) • Your acceleration
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!
Describing Motion: What is Speed? • Rate—any change over time • Speed—the distance an object travels per unit of time. fastest
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
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)
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
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
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.
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
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.
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↑
Draw this on your paper! Y-axis faster slower Distance (meters) Standing still X-axis Time (seconds)
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.
Flash Card • On the front write: • Reference Point • On the back write: • Determines an object’s position and if motion happened