2. ask a ninja And now for something completely different

5. The metric system is comprised of 7 : 1. - (unit of length) Is the distance traveled by light in a vacuum during a time interval of 1/2997294858 th of a second. 2. - (unit of mass) equal to the mass of the international prototype kilogram in Sevres, France. metre kilogram base units

6. 3. - (unit of time) based on the decay of a cesium-133 atom. 4. - unit of electric current 5. - unit of temperature 6. - unit of luminous intensity 7. - unit of amount of substance second Ampere Kelvin candela mole

7. Prefixes To express larger or smaller amounts of these base units, we use prefixes.

8. Working with prefixes: Eg) convert 1.4 cm = _______________ m Step 1: Find the prefix on your conversion chart.

16. 3 x 10 8 m/s 6 370 000 m 6 370 km

17. Significant Digits “The lost and puzzling art of the ancient world”

18. Okay, so there really isn’t anything strange or puzzling about sig digs (or significant figures, sig figs, are they’re also called by lesser physicists), and I’m certain they weren’t developed in ancient China. Sig digs is a system of rules used to determine how many decimal places answers should be rounded to. The system consists of two easy rules (which will haunt you for the rest of your life!)

19. Determining the # of Sig Digs All digits in a number are significant. This includes digits before and after the decimal. Scientific notation does not count. Examples: –5  1 sd –4.5  2 sd –89.9  3 sd –3.4 x 10 -7  2 sd

20. Zero Rule Zeros to the left of the first digit are only place holders and do not count as sig digs. Zeros to the right of the first digit or inside values count as sig digs. Examples: –0.005  1 sd –1.005  4 sd –0.0050001  5 sd

21. Practice: How many sig digs does each of the following values have? –58.00 –5.08 –0.0085 –1.054 –5.00 x 10 9 –0.001 x 10 5

22. What are not sig digs? sd do not include: –Exact numbers The mass of 3 goats is 24.5 kg, what is the mass of each goat...the 3 does not count as a sd. –values from the data booklet

23. Operations with Sig Digs Adding or Subtracting: Your answer should contain the same number of digits after the decimal as the smallest number of digits after the decimal in the question.

24. Example : 4.5 + 7.85 + 6.98247 = ? _ Answer: 19.33247 But since the 4.5 has only 1 sd after the decimal, then the answer must also only have 1 sd after the decimal.. 5.4 – 3.24 = ? _ Answer: 2.16 But we must now change our answer to proper sd… Since the question had, at least, 1 sd after the decimal, the answer must only have 1 sd after the decimal. Proper Answer: 19.3 Example : Proper Answer : 2.2

25. Multiplying and Dividing Rule: When multiplying or dividing, you must have the same number of sd in your final answer as the least number of sd in your question.

26. 5.8 x 10 2 * 1.255 = ? _ Answer: 727.9 Example : Proper Answer : 7.3 x 10 2 Example : Proper Answer : 1.71 2.45 ÷ 1.432= ? _ Answer: 1.71089…

27. If you’re lost… Pages 132 of the Textbook.

28. Do assignment 1

30. https://www.youtube.com/watch?v=llRkf1fnN DM

44. 3.3 x 10 2 m/s

46. Do assignment 2

48. https://www.youtube.com/watch?v=EkHTsc9P U2A

49. 1.80 km

50. 46 m

61. e

66. Do assignment 3 Do lab 7 uniform motion

68. http://www.youtube.com/watch?v=emhxbwVy N4w

69. 38.5 m

73. 0.0067 m/s 2

75. Do assignment 4

85. Do assignment 5 Do lab Review section 1 quiz

87. https://www.youtube.com/watch?v=HHYECUcf C1Y&list=PL224464F48007F658

100. Do assignment 6

118. Do assignment 7

120. https://www.youtube.com/watch?v=GPJBw- TLYZQ

129. Do assignment 8 Do lab

131. https://www.youtube.com/watch?v=0ca9rxQk EiA&list=FLFh2qGd_dOAiaY5L4tkyeLQ

143. do assignment 9 Do lab Review section 2 Quiz Unit review Unit exam