Introducing more sand into the bottle will increase the weight of the bottle and so increase its weight force resulting in it floating lower in the water. Scientists are curious and students can model being a scientist by exploring things that can affect whether an object floats such as its shape, weight or the amount or type of liquid used to float it. This investigations are a perfect opportunity for students to develop experimenting and reporting skills.
This story could provide opportunities for students to raise further questions about floating and sinking. Our website uses a free tool to translate into other languages. This tool is a guide and may not be accurate. For more, see: Information in your language.
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The adult involved is fully responsible for ensuring that the activities are carried out safely. Your email address will not be published. Why do things float in water? Do the balls which float all have something in common? Are they hollow? Test each ball to see if your predictions are correct. Take a ball which sank to the bottom of your container and wrap in bubble wrap. Why does this happen? How are bacteria different to viruses? Safety Notice Science Sparks Wild Sparks Enterprises Ltd are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources.
Ask students: Which weighs more, wax or an equal volume of water? Water weighs more than an equal volume of wax. Which is more dense, wax or water? Water is more dense. Compare the density of clay and water Make sure you have one piece of tape in the center of each pan on the balance. Fill one container with clay and place it on the tape so that it is in the center of the pan. Place an empty container on the tape at the opposite end of the balance. Slowly and carefully add water to the empty container until it is full.
Expected results The clay has a greater mass than an equal volume of water. Ask students: Which weighs more, the clay or an equal volume of water? The clay weighs more than an equal volume of water. Which is more dense, clay or water? Clay is more dense. Knowing the density of an object can help you predict if it will sink or float in water. If an object is more dense than water, would you expect it to sink or float? Objects that are more dense than water sink.
If an object is less dense than water, would you expect it to sink or float? Objects that are less dense than water float. Explain Compare the density of wax, water, and clay on the molecular level. Project the image Wax. Project the image Water. Project the image Clay. Extend Have students explain, in terms of density, why a very heavy object like a big log floats and why a very light object like a tiny grain of sand sinks. Ask students: A giant log can float on a lake, while a tiny grain of sand sinks to the bottom.
Clean-up and Disposal Remind students to wash their hands after completing the activity. All common household or classroom materials can be saved or disposed of in the usual manner. Materials Clay 1 ball for each group Clear plastic container of water Popsicle sticks 20 Rubber band.
Engage 1. As a demonstration, place a clay ball in water to show that clay sinks. Materials for the demonstration: Ball of clay Clear plastic container of water Procedure Hold up a ball of clay about the size of a ping pong ball and ask students if they think it will sink or float in water. Place the clay in the water.
Expected result The clay ball will sink. Expected result It will sink. Explore 2. Have students put smaller and smaller pieces of clay in water. Materials for each group Clear plastic container of water Clay ball about the size of a marble. Procedure Place your ball of clay in the water to see if it floats of sinks. Does it float or sink? Repeat this process two more times to make smaller and smaller clay balls. Test each one to see if it sinks or floats.
Ask students: Do you think clay is more dense than water or less dense than water? Demonstrate that wood is less dense than water. Materials for the demonstration Popsicle sticks 20 Rubber band Clear plastic container Water Procedure Place 1 popsicle stick in the water to see if it sinks or floats.
Ask students: Do you think wood is more dense than water or less dense than water? Less dense What do you think will happen if we tie 20 popsicle sticks together — will the bundle of sticks sink or float?
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