GOOD DAY LEARNERS.

Today we will discuss mass. 
MASS: The amount of matter or material in an object.
WEIGHT: The measure of heaviness of an object which is related to the force of gravity.

The basic unit of measurement for the mass (often just called weight) of an object is the kilogram (kg). Other units of measurements dealing with mass are grams, milligrams and tons.

*   The mass of heavy objects, such as body mass is measured in kilograms.

*   The masses of smaller objects, such as a small bag of sugar are measured in grams.

*   Very small quantities such as the amount of aspirin in a tablet, are measured in milligrams.

Remember: Moving from mg through to kg, the rule is to divide by the factor in red.

                    Moving in the opposite direction ie from km to mm, we multiply by the factor in red. 

        mg     1000     g     1000     kg

e.g.:        5 000 mg converted to g = 5 g, we divide by a 1000.

CALCULATIONS BETWEEN UNITS OF MASS

*   Always make sure that you are working in the same units. If you are given g and kg in a question, convert all measurements into either g or kg.

*   When you are given a cost per weigth/mass, ensure that you work in the same unit of mass/weight. E.g. if they give you a cost of R2,50/g, ensure that you are also working in grams. 

Please find attached some examples. There are also three exercises added. Please work in your exercise books. Remember date and heading please.

Send pics of your answers to your teacher, and answers will then be made available for you. 

Mrs H Maharaj  0735581246

Mrs S Cassim    0847862585

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