Topic 1.4 - Density

Question 1

When do objects float in water?

Answer 1

When the object is less dense than the water displaced by it.

Question 2

State the eqaution for density. Gvie appropriate units.

Answer 2

Question 3

Describe a method to determine the density of a regular solid

Answer 3

• Take measurements of relevant dimensions using a ruler
• Calculate the volume using an appropriate equation
• Measure mass using a balance and calculate density using density = mass/volume

Question 4

Descirbe a method to determine the density of an irregular solid

Answer 4

• Measure volume by submersion: read the volue of liquid, submerge the solid, then read the change in volume (which would equal volume of object)
• Measure mass using a balance
• Use density = mass/volume to calculate density

Question 5

Descrieb a method to determine the density of a liquid

Answer 5

• Place an empty beaker on top of a balance and zero the device
• Pour liquid into the beaker to determine the mass
• Pour the same liquid into a measurong cyclinder and read off the volume
• Use density = mass/volume to calculate density