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Unit summary

Check your knowledge and understanding

1. Express these volumes in SI units and write them 4. Some cotton wool is
in ascending order: tightly compressed
into ‘bricks’. How has
a) 50 ml b) 0.6 dm 3 c) 40 cm 3
textbooks nis edu kz
the mass of cotton
d) 1.2 l e) 700 mm 3 wool changed? What
2. A classmate says that if the density of 1 m of about its density
3
water is 1000 kg/m then the density of 2 m of and volume?
3
3
water is 2000 kg/m and the density of 3 m of 5. The mass of a wooden
3
3
water is 3000 kg/m . What do you think about this rolling pin is 100 g.
3
statement? What mass would it
3. How can the density of a chocolate bar be have if it were twice as long and twice as thin at
measured? What tools will you need? the same time? And what if it were twice as short
and twice as thick?

Assess your learning

Reflect on how well you met the learning objectives of this unit. Use the worksheet provided by
your teachers to develop your own targets.

How confident am I?

I can …
use a measuring cylinder (beaker) to measure the volume of liquids or solid objects of various shapes
measure the mass of objects using electronic, spring and balance scales

understand that mass is a measure of the amount of matter in an object, and that the mass of an object
affects the change of the object’s speed
describe methods to determine the density of liquids and solid objects of regular and irregular shape

make calculations using the density = mass / volume equation
give definitions of mass, volume and density

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