102b
Let’s weigh some more
Term 4
Mass is the measure of how much stuff or matter there is in an object. The more there is, the harder it is to move it.
Weight is a measure of the force of gravity pulling on that matter. Gravity is less on the moon so things weigh less there.
On earth for everyday purposes we use the same measures for both mass and weight. We measure mass in kilograms and grams.
Different scales
We use different kinds of scales to measure mass and weight. We measure mass with a balance and weight with a spring scale.
A litre of water has a mass of 1 kg
Find their weight
Write the weight in kg shown on each of these spring scales.
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We use grams to measure the mass of smaller or lighter objects and to measure fractions of a kilogram. 1 000 g = 1 kg On this spring scale, each small line is 10 grams of weight. The tomatoes weigh 320 grams. |
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How much do they weigh?
Draw where the arrow on the scale must go each time.
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Make a kilogram.
Add on to make 1 kg (1 000 g).
a. 125 g + 250 g + 125 g + g = 1 000 g (1 kg)
b. 50 g + 30 g + 240 g + 60 g + 100 g + = 1 kg
c. 57 g + 46 g + 243 g + 334 g = = 1 000 g (1 kg)
d. 50 g + 90 g + 160 g + = 1 000 g (1 kg)
