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# Floating and Sinking

## on Aug 09, 2010

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## Floating and SinkingPresentation Transcript

• Floating and
• What does ﬂoating and sinking mean? I think ﬂoating means that an item is on or under the surface. I think sinking means when an item sinks all the way to the bottom.
• Questions
• Questions • How does an item ﬂoat ? • How does it sink? • Does density make objects ﬂoat?
• • Density is in every type of object that has any kind of material. High density objects will sink and low density object will ﬂoat.
• Does density have the ability to make an item ﬂoat? • Density is in every type of object that has any kind of material. High density objects will sink and low density object will ﬂoat.
• Diagram
• Diagram When we pushed the balloon under the water, the water pushed back. This is called upthrust .
• Diagram The water rose when we pushed the balloo down. When we pushed the balloon under the water, the water pushed back. This is called upthrust .
• Diagram The water rose when we pushed the balloo down. When we pushed the balloon under the water, the water pushed back. This is called upthrust . As we pushed the balloon under the water, some of the water pushed out of the way. The water levels rose. This is called displacement
• Diagram The water rose when we pushed the balloo down. The balloon ﬂoats When we pushed the on the water balloon under the water, because it is ﬁlled the water pushed back. This is called upthrust . with air. As we pushed the balloon under the water, some of the water pushed out of the way. The water levels rose. This is called displacement
• • First we cracked the egg and tipped the yolk out. Then we tipped the ﬁrst egg white in to see if it ﬂoated. It didn’t. Then you whisk the the other egg white and pour it in the water. It will ﬂoat because we have added air.
• Trapped air • First we cracked the egg and tipped the yolk out. Then we tipped the ﬁrst egg white in to see if it ﬂoated. It didn’t. Then you whisk the the other egg white and pour it in the water. It will ﬂoat because we have added air.
• Trapped air • First we cracked the egg and tipped the yolk out. Then we tipped the ﬁrst egg white in to see if it ﬂoated. It didn’t. Then you whisk the the other egg white and pour it in the water. It will ﬂoat because we have added air.
• Changing an object’s shape If you change an object’s shape and make it hollow it will ﬂoat. A ﬂat dense object will sink, but if it’s ﬂat it will actually sink.
• Credits Thanks to Mrs van Zyl I