P6.1 Density

Question 1

Density equation

Answer 1

D = v / m

Question 2

Equation for volume of a cylinder

Answer 2

Pie r squared x h

Question 3

Volume of cuboid equation

Answer 3

H x l x w

Question 4

What is density

Answer 4

Mass per unit volume

Question 5

What can we use to measure length

Answer 5

Metre ruler, standard ruler,

Question 6

How to find density of a regular object

Answer 6

Find mass using balance, measure lengths using ruler, calculate volume

Question 7

How to find the density of an irregular object

Answer 7

Measure object
Fill Eureka and fill it to the top with measuring cylinder underneath spout
Immerse object in water
Measure volume of water displaced in the cylinder
Volume of water displaced = volume of object
Work out using equation

Question 8

Explain why ice floats

Answer 8

It is less dense than a liquid

Question 9

Why does taking measurements more than once improve accuracy

Answer 9

A mean can be calculated reducing effect of random errors