REVISION 5 (Y3)

What is density?

• Density is a measure of mass per volume.

• Density is a measure of volume per mass.

• Density is a measure of mass.

• Density is a measure of volume.

Why doesn't a toy duck sink?

• A toy duck more dense than water.

• A toy duck is light.

• A toy duck less dense than water.

Select the objects sink in water.

• Coin

• Ping - pong ball

• Marble

• Soap

Select the objects float in water.

• Sponge

• Cork

• Stone

• Wood

Compare the density of coloured water, cooking oil and glycerine. Which is the most dense?

An object that is ____________ dense than water will sink.

An object that is __________ dense than water will float.

How can we sink an orange in water?

• Add salt in water.

• Peel off orange .

• Cut orange into two.

Oil will _________ on the surface of the water as oil is _______dense than the water.

• sink , less

• float , more

• float , less

• sink , more

Why sponge float on water?

• sponge less dense than water

• sponge has a lot of air space.

• sponge more dense than water.