The Metric System Mass using Grams

Mass Mass is not the same as Weight!!! Is how much an object is able to hold or how much the object contains. The mass of an object is measured in the unit grams. Mass is not the same as Weight!!!

Weight Is the measure of gravity’s pull on an object. Weight changes based on the gravity around you. For example a person on the Earth would not weigh the same as they would on the moon.

Here is a video to help you remember https://youtu.be/1whMAIGNq7E

The Mass of an object Can be measured using the Metric System with the unit grams. For example mass can be measured in: Kilograms Grams Milligrams

Metric Units 1 Kilogram (kg) = 1000 Grams (g) 1 Hectogram (hg) = 100 Grams (g) 1 Dekagram (dag) = 10 Grams (g) 1 Decigram (dg) = .1 Grams (g) 1 Centigram (cg) = .01 Grams (g) 1 Milligram (mg) = .001 Grams (g)

When Measuring Mass We use a triple-beam balance to find the mass of an object. The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right side of the scale to match up.

Measuring Mass – Triple-Beam Balance 1st – Place the object on the scale. 2nd – Slide the large weight to the right until the arm drops below the line. Move the rider back one groove. Make sure it “locks” into place 3rd – Repeat this process with the top weight. When the arm moves below the line, back it up one groove 4th – Slide the small weight on the front beam until the lines match up. 5th – Add the amounts on each beam to find the total mass to the nearest tenth of a gram.

Next Class Our next class will be a lab measuring the mass of object Here we will use gram weights and a balance scale to measure different amounts of grams. We may also measure objects in our classroom.

Lets Think About Mass? At this time I would like you to just think about which unit you would use to measure the mass of each object. Would you use a kilogram, dekagram, gram, decigram, or milligram as a unit to weigh these following objects?

Unit Facts Kilogram is a bigger unit. Objects with more mass are measured in Kilogram. Examples – cycle, car, telephone Objects with less mass are measured in grams. Example – pins, pencils

A paperclip What unit would you use to measure a paper clip? A Gram

Bag of Rice What unit would you use to measure a bag of rice? A Kilogram

A Snowflake A Milligram What unit would you use to measure a snowflake? A Milligram

2 Nickels What unit would you use to measure 2 nickels A Dekagram

Bananas What unit of measurement (grams or kilograms) would be best to measure the weight of a bunch of bananas? Kilograms

A feather What unit of measurement (grams or kilograms) would be best to measure the weight of a feather? Grams

Bag of flour What unit of measurement (grams or kilograms) would be best to measure the weight of a bag of flour? Kilograms

A Seashell What unit of measurement (grams or kilograms) would be best to measure the weight of a small seashell? Grams

GREAT JOB!!!

More or less Here you will be given two units you will have to tell me if the first unit is more or less then the second unit. Do the work at your seat quietly. Raise your hand when you are finished.

Which is….. Which weight is lighter?: 60 grams or 3 kilograms? 60 grams is lighter! Which weight is heavier: 1,000 grams or 1 kilogram? Trick question – they’re the same weight! Which weight is lighter: 700 grams or 1 kilogram? 700 grams is lighter!

Is 960 grams more or less than a kilogram? Answer- 960 grams is less than a Kilogram as 1 Kg = 1,000 grams 960 grams < 1,000 grams

Converting Using Grams Here you will convert one amount from one unit to another. Do the work at your seat quietly. Raise your hand when you are finished.

How many grams are there in 9 Kg? Answer- 9,000 grams

A Kitten has a mass of 3,000 grams. What is its mass in Kilograms? Answer – 3 Kg

Review

Kilogram is used to measure ----. Length Capacity mass

Which has more mass? A B C

True or False 5 Kg is less than 3299 grams Mass of an object does not depend on the size of an object

Grams and Kilograms are Metric units to measure weight. Most countries in the world (countries in green) use Metric units like grams and kilograms to weigh things.

Now Try this worksheet This should be completed alone and in silence. if you do not finish please take it home and complete it for homework. We will go over the worksheet in the next class.