1. MASS AND WEIGHT

2. What is mass?  Mass is:  A measurement of how much matter is in an object.  the amount of matter an object has.

3. How to Measure Mass?  Mass is usually measured in kilograms which is abbreviated as kg.

4. Tools for Measuring Mass  The Triple Beam Balance is the tool we use to measure mass.

5. Weight  It is the amount of mass of an object, it is dependent upon gravity.

6. Some Tools for Measuring weight  spring balance spring balance  electronic scale electronic scale  beam balance beam balance  bathroom scale bathroom scale

7. Use this scale to show… 1.5 kg 2.5kg 3.5kg 2kg Use this scale to show… 225g 375g 625g 975g

8. Use this scale to show… 5kg 2.5kg 1.8kg 3.2kg Use this scale to show… 250g 475g 650g 825g

9. Use this scale to show… 0.5kg 1.25kg 2.5kg 3.0kg Use this scale to show… 150g 450g 750g 950g

10. 1kg2kg Use this scale to show… 0.5kg 1.5kg 2.5kg 3kg Use this scale to show… 200g 400g 750g 950g

11. COMPARE AND CONTRAST MASS vs. WEIGHT  Always remains constant Depends on gravity  Does not depend on gravity weight= mass x gravity weight of an object changes if the gravity changes

12. Did you know…  1 pound = 453,59 grams  1 ounce = 28.34 grams  1 ounce = 0.0625 pounds  1 ounce = 28,349.52 milligrams

13. Basic unit: GRAM  Tonnes (1000kg)  Kilograms  Hectograms  Dekagrams  Grams  Decigrams  Centigrams  Milligrams

15. Exercise 1: Which one is larger?  1 Pound or 100 Grams  1 Kilogram or 1 Pound  1 Ounce or 1000 Milligrams  1 kilogram or 1500 grams  1200 milligrams or 1 gram  12 milligrams or 12 kilograms  4 kilograms or 4500 grams

16. Exercise s: Convert the following units

17. Solving problems: Choose the correct answer:

19. Some problems…