To figure out which objects float, we need to look at what they are made of and how heavy they are for their size (density).
1.
Boat: Even though boats are big, they are hollow and filled with air. This makes them less dense than water, so they
float.
2.
Rocks: Rocks are solid and heavy. They are more dense than water, so they sink.
3.
Hammer: Hammers are made of metal and wood. Metal is very heavy and dense, so a hammer will sink.
4.
Rubber Duck: Rubber ducks are usually hollow plastic or rubber. They are light and less dense than water, so they
float.
5.
Life Preserver (Ring): These are designed specifically to keep people safe in the water. They are made of lightweight materials that trap air, so they definitely
float.
6.
Magnet: Magnets are made of metal. Metal is denser than water, so it sinks.
7.
Paperclip: Paperclips are small pieces of metal. Even though they are small, metal is denser than water, so they sink.
8.
Sponge: Sponges have many tiny holes filled with air. When you put a dry sponge in water, it stays on top because it is less dense than water, so it
floats.
9.
Spoon: Spoons are made of metal. Like the other metal items, they are denser than water and will sink.
Final Answer:
The objects that would float are:
* The boat
* The rubber duck
* The life preserver (red and white ring)
* The sponge
Parent Tip: Review the logic above to help your child master the concept of sink and float worksheet for kindergarten.
