Aim: To find whether the given materials float or sink in water.
Requirement Checklist: A coin, a cork, a wooden stick, bicycle keys, a pencil, a steel
spoon,flowers, fruits and a tub filled with water.
Procedure: Take a tub filled with water. Place all the above objects in the water.
Observation:Classify the objects into floating and sinking groups.
Inference:Why some materials float and others sink in water?
Answers
Answer:
All objects, including liquids, have a mass-to-volume ratio known as density. Density is a measurement for how compact (close together) the molecules in the object are.
In the first sink or float experiment, you’ll predict the density of common household objects. In the second oil in water experiment, you’ll analyze the density of common liquids.
Floatable Objects Experiment
Sink or Float?
You probably already know that some things will float in water and some will not. Do you know why that is? Sometimes the best way to find out if something will sink or float is just to try it—and that is exactly what you’ll do in this “floatable objects” experiment! Gather up some objects from around your house to test their sinking or floating abilities. Make sure all of the items you pick can get wet!
What You Need:
a large container of water (or fill up a sink or bathtub)
lots of small objects of different weights and materials (plastic, metal, wood, foil, Styrofoam)
a few larger objects
HST worksheet
pen
What You Do:
Look at the objects you collected. Draw a picture of each one in the boxes on the left side of the worksheet.
Make a prediction about each object – do you think it will sink or float in the tub of water? (To make a prediction means to say what you think will happen.) Mark your prediction on the worksheet for each item (circle float or sink).
Drop the objects into the water one at a time. Watch what happens to each one. Did you predict correctly? Circle “float” or “sink” next to each object on the sheet to show the results of your experiment.
What Happened:
Even though some of your items seemed very light (things like a paperclip or a button), they still sank in the water. Some objects that might have seemed sort of heavy (like a wooden block) probably floated.
That is because whether an object sinks or floats in water doesn’t just depend on its weight or size. It also depends on its density. Density is a measure of how solid something is. All things are made up of tiny particles called molecules. If the molecules inside an object are very close together, the item is solid, or dense. If the molecules are farther away from each other, the object is less dense, or less solid. An example of a very dense item is a penny. A cork is less dense.
A penny, paperclip, or button sank because the materials they are made of (metal for a paperclip and penny, plastic for a button) had more density than water. (Their molecules are closer together than water molecules are.) A cork, piece of wood, or Styrofoam floated because those materials have less density than water. All the objects that were less dense than water floated in the water! Objects that were more dense than the water sank.
Oil in Water Experiment
Liquid Density
Do you know why oil floats on water? Would an object that sinks in oil be able to float in water? Try this experiment to find out and learn more about density.
What You Need:
1-cup glass measuring cup
vegetable oil
water
food coloring
corn syrup
small objects (we used a raisin, grape, cork, button, penny, screw, and piece of wax)
I hope it's help you
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Explanation:
Objects do not sink because of their size; they sink because they are less dense than the liquid they are placed in. If an object has more density than the liquid, it will float, and the object is said to be buoyant. Some objects have buoyancy and some do