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September 17 & 18

Take a CLICKER and the

Metric System PRE Assessment

from my desk

Ensure you are completing the side that says PRE!!! (NOT ‘Post’)

On a scale of 1-5 (1 being the least, 5 being the most) how CONFIDENT are you with #1

- No clue what’s going on
- Kinda got it, but then you lost me
- Ehh…I’m ok
- I think I got it, but I’d like more practice
- So confident I could teach it to someone right now

On a scale of 1-5 (1 being the least, 5 being the most) how CONFIDENT are you with #2

- No clue what’s going on
- Kinda got it, but then you lost me
- Ehh…I’m ok
- I think I got it, but I’d like more practice
- So confident I could teach it to someone right now

In which problem was the math easier?

- #1
- #2
- Equal! Both 1 & 2
- I really had NO IDEA what was going on at all in

Bill Nye

- What did you learn? Anything interesting?
- Did you find the error?
- Anything confusing?
- Any comments?

Metric Patrol

- NO ALCOHOL OR PRESCRIPTION MEDICATIONS (Tylenol, Advil, etc is ok)

Lesson 1: Length

T. Trimpe 2008 http://sciencespot.net/

1 mile

1.6 kilometers

1 yard = 0.9144 meters

1 inch = 2.54 centimeters

English vs. Metric Units

Which is longer?

A. 1 mile or 1 kilometer

B. 1 yard or 1 meter

C. 1 inch or 1 centimeter

Left Image: http://webapps.lsa.umich.edu/physics/demolab/controls/imagedemosm.aspx?picid=1167Right Image: http://share.lancealan.com/N800%20ruler.jpg

A. 1 meter or 105 centimeters

B. 4 kilometers or 4400 meters

C. 12 centimeters or 102 millimeters

D. 1200 millimeters or 1 meter

km

Metric Units

m

cm

mm

The basic unit of length in the metric systemisthe meterand is represented by a lowercase m.

Standard: The distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.

- Complete each statement with Metric Units
- 1 Kilometer (km) = 1000meters (m)
- 1 Meter = 100Centimeters (cm)
- 1 Meter = 1000 Millimeters (mm)

Which is larger?

Just like saying What's Larger? 100 cm or 105 cm

Just like saying What's Larger? 4000 m or 4400 m

Just like saying What's Larger?

120 mm or 102 mm

Just like saying What's Larger? 1200 mm or 1000 mm

We are about to learn

DIMENSIONAL

ANALYSIS.

It’s a little different…

But after some practice, it’s easy

(And you’ll need to know this in Chem and Bio)

Dimensional Analysis

How does the math work?

1030 cm = ______ m?

Multiply by aratio of 1

(just like ratios or fractions)

1030 cm .__1_m

1 100 cm

What CANCELS?

1030 m

100

What REMAINS?

SIMPLIFY & Solve

…don’t forget the unit!

10.30 m

OR

10.3 m

Use Metric Magic and Dimensional Analysis to complete the following problems. Need help? Ask a friend or ask a teacher. SHOW ALL WORK, round to at least 2 decimal places!

FIX # 5, 7, 8!!!! (They use ‘l’ instead of ‘L’

ALSO – depending how you round, your answers might vary slightly!!!

1.9768

40.64

156.492

40.56

131.232

279.63

15.14

354.9

110.23

1,609,000

10. CHALLENGE! _____________________________mm = 1 mile

Do you prefer…

- Dimensional Analysis (I’m a numbers person!
- Ladder Method (way easier)
- Either – I can see the benefits of both methods

On a scale of 1-5 (1 being the least, 5 being the most) how CONFIDENT are you with the LADDER METHOD

- No clue what’s going on
- Kinda got it, but then you lost me
- Ehh…I’m ok
- I think I got it, but I’d like more practice
- So confident I could teach it to someone right now

On a scale of 1-5 (1 being the least, 5 being the most) how CONFIDENT are you with DIMENSIONAL ANALYSIS

- No clue what’s going on
- Kinda got it, but then you lost me
- Ehh…I’m ok
- I think I got it, but I’d like more practice
- So confident I could teach it to someone right now

Need some help with dimensional analysis?

Try this YouTube video: http://www.youtube.com/watch?v=XKCZn5MLKvk

Or these two videos from Khan Academy http://www.youtube.com/watch?v=SYkmadc2wOI

http://www.youtube.com/watch?v=w0nqd_HXHPQ

Or this website for some detailed explanations and solved examples:

http://www.alysion.org/dimensional/fun.htm

EXIT SLIP

- Complete the Post Assessment

(on the BACK of your PRE assessment)

Use either LADDER METHOD or DIMENSIONAL ANALYSIS!

- Turn in at the in box
- This is not for a grade, but we will return to this next class
- Take a copy of your HW

This is not for a grade, but we will REVIEW this next class

On a scale of 1-5 (1 being the least, 5 being the most) how CONFIDENT are you with #1

- No clue what’s going on
- Kinda got it, but then you lost me
- Ehh…I’m ok
- I think I got it, but I’d like more practice
- So confident I could teach it to someone right now

On a scale of 1-5 (1 being the least, 5 being the most) how CONFIDENT are you with #2

- No clue what’s going on
- Kinda got it, but then you lost me
- Ehh…I’m ok
- I think I got it, but I’d like more practice
- So confident I could teach it to someone right now

In which problem was the math easier?

- #1
- #2
- Equal! Both 1 & 2
- I really had NO IDEA what was going on at all in

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