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Measurements & Scale

Measurements & Scale. Quinlan Physics. What is Physics?. Start at 1:16 What is Physics ?. It consists of two main components: Matter & Energy Traditional fields are: Acoustics Optics Mechanics Thermodynamics Electromagnetism. Modern extensions including Atomic and nuclear physics

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Measurements & Scale

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  1. Measurements & Scale Quinlan Physics

  2. What is Physics? • Start at 1:16 • What is Physics?

  3. It consists of two main components: Matter & Energy Traditional fields are: Acoustics Optics Mechanics Thermodynamics Electromagnetism Modern extensions including Atomic and nuclear physics Cryogenics Solid-state physics Particle physics Plasma physics Physics

  4. Science- The search for explanations of natural events. • Physics- is the exploration of the fundamental explanations. • Can be everyday ie: hot iron, walking, etc • Theory- a reasonable explanation of natural events based on facts • Facts- repeatable observations of natural events

  5. SI Units • International System- French • All nations use it • Units agreed upon and calibrated to each other are critical to scientific advancement and commerce • Even minute errors in calibration could crash modern technology and large $ loss • Story-metric error

  6. 7 Fundamental Units (to Happiness) • Length meter (m) • Mass kilogram (kg) • Time second (s) • Electric Current Ampere (A) • Temperature Kelvin (K) • Amount of Substance mole (n) • Luminous Intensity candela (cd)

  7. Other units can be created from these 7 units! • Speed= m/s • A Newton= kgm/s^2 • A Watt= Newton/s

  8. Measuring UP! • Meter- was defined by 10,000,000th of a meridian (prior to 1960 an actual bar) now defined by speed of light • Kilogram- the mass of 1 liter of water • Second- based on the vibration on an atom • Mass- amount of matter in an object • Weight- the effect of gravity acting on mass

  9. Make a “body metric ruler” (record the data in your notebook) • My hand span is _______________ cm. The width of my _________ fingernail is __________ cm or ___________ mm. • The length of my arm is __________ m or ___________ cm. • My height is ____________ m or ____________ cm. • My mass in kilograms is ____________ kg. • The length of my forearm is ___________cm. • My foot is ______________ cm. • My wingspan is _______________ cm.

  10. Metric Prefixes M k h dk m d c m µ n l g • NOTE: 1 ml=1 cm^3 • Identify the units of SI & English

  11. Practice conversions • 12kg = ? g • 2.6m = ? cm • 2175mm = ? dm • 20,000ml = ? hl • 44 km/hr = ? m/s • How many liters does this hold? (Draw)

  12. Practice-Oh, the Fun! • 350cm^3 = ? L • 16g = ? mg • 0.75km = ? mm • 675mg = ? g • 75 m^3 = ? cm^3 • 2 hr 10 min = ? sec

  13. Significant Figures (Digits)- Play a role in accurate accounting of error. Rounding to numbers that make sense. They indicate the level of precision that has been measured.

  14. Rules: • Estimate one level past on a manual device (one uncertain number) • Zeros that trail a number with no decimal do not count • Zeros to the left of a number do not count. (Sandwiched do!)

  15. When adding scientific notation • to move the point left one digit, increase the power by 1 • to move the point right one digit, decrease the power by 1

  16. Ex: • 109,000 __________ • 20.00 ____________ • 260.40 ___________ • 0.000647 _________ • .000391 __________ • 0.07080 __________ • .0001 ____________

  17. To 3 sig figs • 84,374 • .0009768 • .0004999 • To 2 sig figs • 417.88 • 1,777,683 • 0.0005033

  18. Accuracy- the closeness of a measurement to the accepted value measured as error- how far “off” a measurement is from what is desired • Precision- the agreement among several measurements made with the same method. Measure as deviation • Draw targets

  19. Olympic Pool Problem • A tolerance must be set x= 50m • Is it perfect? • Tolerance- defines the allowable error. Ex. 50.0 +/- 0.1 m • Max can be 50.10m • Min can be 49.90m • How accurate can concrete be poured?

  20. Loose 50.0 +/- 0.1m nearest dm • Max 50.10m • Min 49.90m • Probable 50.00 +/- 0.01m nearest cm • Max 50.01m • Min 49.99m • Tight 50.000 +/- 0.001m nearest mm • Max 50.001m • Min 49.999m

  21. If a pool is actually 49.99m, and Olympic events are timed to the nearest 0.01s , can this potentially cause a new world record? Michael Phelps’ 400m record is 4:03:84s. Use this to find out if a new record could be set. (Beijing) • The official tolerance for Olympic Pools are +0.00m at the ends of the lane

  22. Key: s(ave)= d/t = 400m/ 242.44s= 1.6499m/s at 49.99m 8 laps are actually 399.92m s=d/t 1.6499m/s=399.92/t • t=242.39s= 4:02:39s YES! New record!!!

  23. If your car has a mass of 2,300 pounds what is its mass in grams? • If you own a parcel of land (as wide as a football field) that is one million yards long, how many centimeters long is it? • Worlds water supply: 326 million cubic miles (3% of which is fresh)

  24. Factor Label • If you have 252 marbles, how many dozen marbles do you have? • You hike 10 miles, how many feet is this? • There are 3 feet in a yard. How many yards are in a mile? • How many centimeters are in a mile? • If you travel 65 miles to Denver, how many kilometers have you traveled?

  25. Meals for Middle Earth • There are 3 hobbits for every elf, and 24 meals for each hobbit. It is vacation time in Middle Earth and the hobbits are coming Rivendale. Currently, there are 258 elves in Rivendale, so how many meals should the elves have for the hobbits to purchase?

  26. Factor Label Fun! • On a typical day at a Gib’s bagel shop, 75 customers have cream cheese on a bagel. The average customer uses 3 ounces of cream cheese on his or her bagel. The store is open 345 days each year. Cream cheese costs $10.00 per 2.5-L container. If you are managing a Gib’s location, how much money should you budget for cream cheese for one year?

  27. An average drummer uses 5 pairs of drum sticks per year. A professional drummer plays about 1172 months. How many drum sticks do they use total?

  28. Create Your Own!! • Need at least 6 conversions • Must have the conversion listed or able to be calculated on transparency • Create a transparency with your word problem written out • 1 sheet per group with your calculated answer • Can be fictional or creative!!! 

  29. Time for your AMAZING creativity to create a factor label problem with your group for the class…or a challenge one for me. 

  30. Read section 2.1 & 2.2 on pg. 32 • Answer questions #1-5, 9-11, 15, 19 pg. 57

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