1.3 Metric System & Measurement

RIGHT HAND SIDE

9/23/15 Learning Objective: I can learn about the metric 

system so that I can better understand how quantities are 

measured.

-Midterm Progress Reports go out Tuesday, 9/29, a week from today! Turn in all your work and do any available retakes/makeups in all your classes. Go to tutorial!

CHAPTER 1 TEST - THURSDAY 10/1/15

9/23/15 Fall Equinox

Sun Crosses Celestial Equator

The September equinox occurs the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s Equator – from north to south. This happens either on September 22, 23, or 24 every year.

The Axial Tilt

The Earth's axis is always tilted at an angle of about 23.5° in relation to the ecliptic, the imaginary plane created by the Earth's path around the Sun. On any other day of the year, either the southern hemisphere or the Northern Hemisphere tilts a little towards the Sun. But on the two equinoxes, the tilt of the Earth's axis is perpendicular to the Sun's rays, like the illustration shows.

Why "Equinox"?

On the equinox, night and day are nearly exactly the same length – 12 hours – all over the world. This is the reason it's called an "equinox", derived from Latin, meaning "equal night". However, even if this is widely accepted, it isn't entirely true. In reality equinoxes don't have exactly 12 hours of daylight

Traditions and Folklore

In the Northern Hemisphere, the September equinox marks the start of fall (autumn). Many cultures and religions celebrate or observe holidays and festivals around the September equinox.

1.3 Tools & Techniques (Measurement Systems)

What is the difference between a measurement, a unit, 

and a quantity?

5 cm, 12 meters, 7 kilograms = measurement

Centimeter (cm), liter (L), gram (g), second (sec) = unit

Length, volume, mass, area, time, temperature = quantity

What is the quantity and unit of the following:

50 mL (example: volume, milliliter)

4.0 mg

53 cm^3

25 km^2



Do worksheet 1.3 'Metric Worksheet' with table groups

Glue into notebooks as right hand side, new information