Page 140 - Science Coursebook

Unit 9
Unit 9 End of unit questions

9.1 The table shows the densities of six different substances.
Substance Density in g/cm 3
water 1.0
copper 8.9
paraffi n wax 0.90
steel 7.8
ice 0.92
lead 11.4

a Which two substances in the table would float in water? Explain how you

can tell. [3]
b Which would have more volume, 1 kg of lead or 1 kg of copper? Explain
how you can tell. [2]

9.2 The diagram shows a cube of marble. Each side of the cube is 2 cm in length.

a Calculate the volume of the cube in cm . [2]
3
b The cube has a mass of 20.8 g. Calculate the density of marble. [2]

9.3 The diagram shows a brick lying on the floor. The brick has a weight of 23 N.
The brick is flat and smooth on the side in contact with the floor.

5 cm

20 cm
10 cm

138 9 Forces in action