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

Developed by the French in the late 1700’s.

Based on powers of ten.

Developed by the French in the late 1700’s.

Based on powers of ten. Used by almost every country in the

world, with the notable exception of the USA.

Especially used by scientists. Abbreviated SI, which is French for

Systeme International.

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 (English Standard) and the navigation software used metric.

Units can be scaled by factors of 10 depending on what you are measuring So it can be used for small

measurements as well as large

Kilo- Hecto- Deca- Base- Deci- Centi- Milli-Kilo- Hecto- Deca- Base- Deci- Centi- Milli- 1000 100 10 1 0.1 0.01 1000 100 10 1 0.1 0.01

0.0010.001

Mass Weight Length Volume Density

Mass is the amount of matter that makes up an object.

Mass is the amount of matter that makes up an object.

A golf ball and a ping pong ball are the same size, but the golf ball has a lot more matter in it. So the golf ball will have more mass.

The mass of an object will not change unless we add or subtract matter from it.

Unit used: Gram (g) Tool Used: Balance

A paper clip has the mass of about 1 gram.

Weight is a measure of the force of gravity on an object.

Your weight can change depending on the force of gravity. The gravity will change depending on the planet you are on.

The unit for weight is the Newton (N).

Weight is a measure of the force of gravity on an object.

EarthEarth

1 1 gravitygravity

MoonMoon

1/61/6thth gravitygravity

JupiterJupiter

2.5 2.5 gravitiegravitie

ss

massmass 30kg30kg 30kg30kg 30kg30kg

weightweight 300N300N 50N50N 750N750N

Jill’s mass remains the same on earth and the moon, but her weight changes due to different gravitational forces.

Length is the distance between two points.

Unit used: Meter (m) Tool Used: Ruler or

meter stick

Volume is the amount of space an object takes up.

Unit used: Liter (l) Tool Used: graduated

cylinder

Volume is the amount of space an object takes up.

Unit used: Liter (l) Tool Used: graduated

cylinder

Liquids form a meniscus (curved, upper surface)

To correctly read the volume, read the bottom of the curve.

We can find the volume of box shapes by the formula: V = Length x Width x V = Length x Width x

HeightHeight

We can use water displacement to find the volume of irregular shaped objects

Ex: We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the rock has a volume of 2 ml.

1cm3 water =1 ml of water = 1 gram

Density is the amount of matter (mass) compared to the amount of space (volume) the object occupies.

Unit for density is g/ml

Density is the amount of matter (mass) compared to the amount of space (volume) the object occupies.

Unit for density is g/ml

Equation:

Unit used: Celsius (C) Tool Used: Thermometer 0o Celsius= freezing 100o Celsius= boiling

•32o F= freezing point•212o F= boiling point

PrefixAbbreviation

Power of 10

Kilo k 1000

Hecto h 100

Deka da 10

Base unitMeter (m)Liter (L)Gram (g)

1

Deci d 0.1

Centi c 0.01

Milli m 0.001

King Henry Died By Drinking Chocolate Milk

If moving to the right, move the decimal to the right that many steps.

If moving the left, move the decimal to the left that many steps.

Convert 15 grams (g) to kilograms (kg)

Convert 115 millimeters (cm) to decimeters (mm).