define independent and dependent variables. make up your own example. what is a theory? how is a...
TRANSCRIPT
Warm up 9/6
Define Independent and Dependent Variables. Make up your own example.
What is a theory?
How is a theory different from a hypothesis?
Way Back When . . .
When people first started to measure things, the systems were different in different parts of the world.
Many systems were based on parts of the body.
Foot Inch
How to Measure?
Many countries tried to make a system of measurement.
Both France and England came up with systems that are used today.
England started the English Standard System and France started the Metric
System.
Comparing the two Systems . . . English Standard
System Based on:
2, 3, 4, 8, 16 Generally uses
fractions
2 pints in a quart 3 feet in a yard
4 quarts in a gallon12 inches in a foot
16 ounces in a pound
Metric SystemBased on: 10
(like U.S. money)
Generally uses decimals
100 centimeters in a meter 1000 grams in a kilogram1000 milliliters in a liter
Why the Metric System?
Over 95% of the world uses the Metric System.
The metric or SI (scientific international) system is aids scientists in sharing measurements No need to convert another person’s data if we
all work in SI Ex/ NASA still works in imperial units and has
had difficulty when needing to work with other groups that use metric▪ In 1999 the Mars Climate Orbiter was lost because
the altitude control system used imperial units and the navigation software used metric.
Metric
Units can be scaled by factors of 10 depending on what you are measuring So it can be used for small stuff as well as
large
Kilo- Hecto- Deca- Base- Deci- Centi- Milli-
1000 100 10 1 1/10th 1/100th 1/1000th
You are only responsible for the units in black
Mass
Measurement: Mass Unit used: Gram (g) Tool Used: Balance
A paper clip has the mass of about 1 gram.
Length/Distance Measurement: length/distance Unit used: Meter (m) Tool Used: Ruler/meter stick
A centimeter is about the width of a small fingernail
Volume
A liter is just a little bit more than 1 quart (or 2 pints)
Measurement: Volume
Unit used: Liter (l) Tool Used:
graduated cylinder
Temperature
Measurement: Temperature Unit used: Celsius (C) Tool Used: Thermometer 0o Celsius= freezing 100o Celsius= boiling
Today . . .
As of the late 1970s, only the United States, Liberia (Africa) and Myanmar (formerly Burma in Asia) use the English Standard System.
Every other country, and scientists worldwide, use the metric system.