Book Week at RPS - NZ Authors Visits

Sharon Holt

James Russell

Dawn McMillan

Trip to the Maritime Museum

Waiting for the Cannon to shoot

Will it float?

Will it sink?

Floating and Sinking

A Floating System

“I think some tings float and sink because floating things have their particles spread out and they are less dense than the water. Water is heavier than air. I think that my tooth would sink because the tooth would be denser than the water and has no air inside it. A boat floats because there is air in it, and it is less dense than the water.” - Vesa

“I think that things that float their particles are spread out, i.e. if you have a plastic spoon and a coin. The coin is heavier for its size and the plastic spoon is light and it is less dense than the water. A marble, folded tinfoil, a tooth, a rock and a tooth pick will sink. These things will float: pumice rock, tinfoil, string and hair all float”. - Gemma

 “I think some things float because… they have air trapped inside. I think some things sink because… if you put a piece of tinfoil folded tightly together in the water all its particles are squished together, it will sink. Put a floating object in the water, the force of the water is pushing the object up. For example put a brick into the water and it sinks. It pushes the water up. The water may overflow. It depends how big the container is.” - Angus.

“I think some things float because they have air trapped inside. Their particles are spread out can help things float. The particles that are stuck together help the thing to sink. Things that have no air in it will sink. If things are light the water may push the object up. If the object has water in it, it may be pushed down”. - Willa.

“I think some things float because they have air inside and the particles are spread out and its density is lighter than the density of the water. If an object t is shaped like a bowl, it will float like a boat. If the object has air in it, the water will push it up”. - Tyler.

I think some things that float, have air inside but things that sink have no air in them. When the object’s particles are stuck together, they might be in a ball. For example a marble is a ball and it has no air inside and that’s why it sinks. Things in different shapes can float or sink. Leaves float because their particles are spread out. Tennis balls float because they have air trapped inside. That’s all I know!” - Bronte

“I think some things float because the density of the object is spread out. If the particles of the object are stuck together the object will sink. Some stuff also float because the weight is spread out. The water helps push the object up. When, for example, paper gets soggy and wet, it starts to sink”. - Tui

 “Some objects float and some objects sink. The object that floats is fine. The object that sinks is ok. Some things float because they have air inside. Water holds things up. If you push a ball under water and you let it go, it will pop up”. - James

 “I thinks some things sink because they are heavy. A marble is small but it will sink. My tooth will sink because it doesn’t have air trapped inside”. - Julia

“I think some things float because the water is denser than them. The shape of an object helps it lay on top of the water. Some heavy things float because their weight is spread out. Some light things can sink because their particles are close together. The shape of an object can make it float or sink”. - Tessa

“I think some things float because their shape helps them float. For example if a ball of playdough is flattened it floats because its particles have been spread out. Boats float in the ocean, they are heavy but they float because the water is denser than the boat.” -Fraser

“I think some things float because they have air inside. A tooth will sink because it has no air inside. A boat float because it has air inside. Folded tinfoil sinks because its particles are close together”. - Kelly

 “I think some light things sink because they have holes in them and the water gets in and they have no air in them. A boat floats because it has air trapped inside and its particles are spread out, also it is less dense than the water. An anchor sinks because its particles are all close together and it is heavy for its size. A pencil floats because of its shape. A container can float or sink. If it is full of air, it will float. If it is full of rocks, it will sink”. - Oscar

“I think some things sink because their particles are close together. A rock will sink, but a pumice rock has air trapped inside and it is light for its size will float. The shape of a thing will help it float or sink. Even though a rock’s shape is spread out, it will sink because it is heavier than the water. Some things have air trapped inside, like a ball it will float. If you put things that float in the water and you put your hand on them, the water will push up. That is called force. It is a pushing force. There is a floating force and a sinking force”.- Connor

 “I think some things float because their density is spread out and its particles are spread out too. The force of the water is holding the object up. Things that are shaped like a bowl can float. If the density is squashed together the object will sink”. - Jaden  

 “I think things float because they have air trapped inside. Also their shape is spread out and they are less dense than the water. I think things sink because they do not have air inside them. Also their particles are close together. Things float because the water pushes them up. The force of the water is pushing them up on top of the water. Water has to make room for a sinking thing’. - Finn

“Some things sink because if something is heavy like a brick and it does not have holes and the density is compacted and it does not have air trapped inside it will sink. Things that float like a boat is heavy but it floats because of two reasons: it has air inside and the other reason is that its shape. Even though it has people inside it won’t sink”. - Ollie