Density Sink or Float

Density

Define density

Give the units for mass

State how to measure mass

Give the units for volume

State how to measure volume

Sink or float!

Over the next few slides I want you to decide whether the object would sink in water or float!

Multiple Choice

Paperclip!

• Sink

• Float

Multiple Choice

Wooden log

• Sink

• Float

Multiple Choice

Empty plastic bottle

• Sink

• Float

Multiple Choice

Rock

• Sink

• Float

What is mass?

The amount of matter in an object.

​We measure mass in kilograms

What is density?

Density is a measure of how much mass an object has per volume.

In this image, the cube on the right is MORE dense than the cube on the left.

The bowling ball and the soccer ball are the same size (they have the same volume),

BUT they do NOT have the same density. The bowling ball is denser. It has more matter. That also means it is heavier (has more weight). More weight means it takes more force to move it. Think about trying to kick both of those balls. Why would one go flying and the other break your foot. Because of density.

By squeezing this bread and making it smaller, it becomes denser. 

Why do some things float and some things sink?

• Things float and sink depending on their DENSITY

• Things that SINK are MORE DENSE than water

• Things that FLOAT are LESS DENSE than water

Multiple Choice

State the units for mass

• cm

• ml

• kg

• s

Multiple Choice

Name the piece of equipment used to measure mass

• Measuring cylinder

• Balance

• Thermometer

• Measuring tape

What is volume?

The volume of an object means how much space it takes up in 3D. You can use a measuring cylinder to find the volume of a liquid, or you can times together the height, width and length of an object to find the volume. The units for volume are cm3.

Multiple Choice

What is meant by volume?

• How much space something takes up in 3D.

• How heavy something is.

Multiple Choice

Give the units for volume

• cm

• kg

• cm3

• cm2

Multiple Choice

What piece of equipment would you use to measure the volume of a liquid?

• Measuring tape

• Balance

• Ruler

• Measuring cylinder

Multiple Choice

What two types of measurements make up DENSITY?

• Mass and Volume

• Temperature and Mass

• Grams and Centimeters

• Volume and Weight