## Why some objects float and others sink?

An object floats when the weight force on the object is balanced by the upward push of the water on the object. If the weight force down is larger than the upward push of the water on the object then the object will sink. If the reverse is true then the object will rise – rising is the opposite of sinking.

## Does a paperclip sink or float?

It seems to defy the laws of physics, but a paper clip made of steel can indeed float on the water surface. The high surface tension helps the paper clip – with much higher density – float on the water. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.

## Will a pencil sink or float?

The pencil would float at the same level as it did before the extra salt was added. The pencil would float lower than it did before the extra salt was added. Now pour the salt water out of the cylinder into the large plastic bowl. Later you will throw this water away.

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## Does cotton float or sink in water?

Cotton balls only float while is air trapped between the fibres. As water creeps in and replaces the air trapped in those tiny spaces, the cotton ball becomes more and more submerged. When all the air has been replaced by water, the cotton ball sinks.

## How do you introduce a sink and float?

Teacher holds up, one item at the time, and asks students to put thumbs up if they think it will float or thumbs down if they think the item will sink.

## How do you explain density to a 5 year old?

Density measures the mass of an object or substance compared to its volume. The equation we use to find density is: density = mass / volume. If an object is heavy and compact, it has a high density. If an object is light and takes up a lot of space, it has a low density.

## Will a paperclip sink?

As it weighs much more than the water it is displacing, it will sink. However, the surface tension changes things for the paperclip. With the surface tension bending the water, it displaces more than half of a gram of water, allowing the paperclip to float, delicately, on the surface.

## Why did the paperclip sink when soap was added?

When you initially drop the paper clip into the bowl of water, it sinks, as the paperclip is too dense. Adding the dish soap breaks the bonds between the water molecules, thus breaking the surface tension and causing the paper clip to sink.

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## What are the three rules of sinking and floating?

Explanation of Answers If an object has a higher density than the fluid it is in (fluid can mean liquid or gas), it will sink. If it has a lower density, it will float. 2. If something’s density is lesser than the water’s density, then it will float on water’s surface, otherwise it will sink.

## Will a toy car sink or float?

A bin or sink filled with water, various household objects including ones that float (feather, Lego, bath toy, crayon, ping pong ball, plastic utensil, pencil, etc.) and ones that don’t float (toy cars, coins, metal spoon, eraser, dry pasta, pipe cleaner, etc.), towel.

## Will a lemon sink or float?

The whole lemon floats. When the lemon pieces are placed into the water they sink! The outer skin of the lemon is waterproof and protects the lemon from rain and extreme weather. The extra weight from the water causes the lemon pieces to sink to the bottom of the bowl.

## Does a sponge sink or float?

Does a sponge sink or float in water? A sponge will float on the water until it has absorbed water and losses it’s air pockets, then it will sink.