1. The Metric System
Mass using Grams

2. 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!!!

3. 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.

4. Here is a video to help you remember

5. 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

6. 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)

7. 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.

8. 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.

9. 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.

10. 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?

11. 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

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

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

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

15. 2 Nickels
What unit would you use to measure 2 nickels
A Dekagram

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

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

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

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

20. GREAT JOB!!!

21. 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.

22. 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!

23. 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

24. 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.

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

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

27. Review

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

29. Which has more mass? A B C

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

31. 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.

32. 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.