8/27/13

Measurement Tools

Length Length- is the distance

between two points. We use a metric ruler to

measure length. The standard unit of length

we use is the meter (m). Inches (not metric)

Centimeters**

What is Volume?

Volume is the measure of the capacity of a container.

It is the measure of how much a container of a particular shape will hold - liquids, dry substances, etc.

Tool- graduated cylinder Standard unit is Liter (L)

Measuring Mass Mass is the amount of matter in an object Matter is some thing that has mass and

takes up space Mass is measured in grams (g) and kilograms

(kg) 1 paper clip =1 gram 1000g = 1kg

Tools for measuring Mass

The triple beam balance

How to use a triple beam balance

1) Make sure that the balance scale is at zero. 2) Place object on balance and move the

largest rider one notch at a time until the beam drops. (100’s spot) Move the rider back one notch (make sure it locks in place)

3) Move the next largest rider until the beam drops (10’s spot). Back it up one notch.

4) Move the smallest rider (1’s spot) until the beam swings equally above and below the zero mark.

5) Add up all the numbers to find the mass!

Calculate The Mass

Spring scale- a balance that measures weight by the tension on a helical springA spring scale is used to measure force such as weight.Unit= Newtons

Mass Vs Weight

Mass does not depend on gravity

The mass of an object always remains the same

Weight depends on gravity

Weight equals Mass X gravity

The weight of an object changes if the pull of gravity changes

Temperature

We use a thermometer to measure temperature.

While we are use to measuring temperature in Fahrenheit, the rest of the world uses Celsius.

Kelvin is another unit for temperature.

Density The quantity of something per unit

measure, especially per unit length, area, or volume.

Units= grams per cubic centimeter or g/cm^3

Formula: density=mass/volume or d=m/v

1. Frank has a paper clip. It has a mass of 9g and a volume of 3cm^3 . What is its density?

2. Frank also has an eraser. It has a mass of 3g, and a volume of 1cm^3 . What is its density?

3. Jack has a rock. The rock has a mass of 6g and a volume of 3cm^3 . What is the density of the rock?

4. Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm^3 . What is the density of the rock?

5. Alicia has a watch. It has a mass of 4g and a volume of 2cm^3 . What is the density of the watch?

6. Mia has a wallet. It has a mass of 15g and a volume of 5cm^3 . What is the density of the wallet?