Roofs, powders and measures
Answers are for parents and teachers.
1
Describe your house roof or a roof you can see: its shape, its material and why it suits the weather.
Answers differ, for example: flat, concrete, because it is hot and dry.
2
A bag of sugar is 2 kg and a bag of salt is 1 kg. What is the total mass in grams?
2 + 1 = 3 kg, and 3 × 1000 = 3000 g.
3
You pour 250 mL, then 250 mL, then 500 mL of water into one jug. How many mL, and how many litres?
250 + 250 + 500 = 1000 mL, which is 1 L.
4
Test three objects at home with a magnet (a grown-up helps). Write which are pulled.
Answers differ. Only iron, nickel and steel objects are pulled.
5
Explain with the words “mass” and “air” why a pumped-up ball has more mass than a flat one.
The air inside is matter and has mass, so the ball plus air has more mass.