Who explored why objects float

Materials: 4 paper clips, 4 pebbles, 4 straws, 4 pennies, 4 ice cubes, 4 spoons, 4 small twigs, 4 erasers, 4 small tubes of water, and 4 "Data Gathering Sheets". Procedure: What types of things float down a river? How does water carry objects? What do you think makes objects float or sink?

Allow students to think about answers to these questions. Write some of the ideas on the board. Divide the students into groups of three to four. Give each group a small tube of water and one of each of the materials. Give specific instructions for the students not to play in the water. Give each group a copy of the data-gathering sheet.

Each group will then write their predictions on their sheet. After writing their predictions allow each group to test their predictions by putting them into the water. Ask the students to discuss, among the group, what they had seen during the experiment. After the groups have finished discussing, have all the students gather in a circle. Begin by asking some of the students what they had seen during the experiment and if it went along with the group's prediction.

Ask them "What objects sank? Assessment: The students will be assessed by listening to their answers in the discussion and also assessed by checking their "Data Gathering Sheet". Useful Internet Resources: www. Science Process Skills: Observing, communicating, and classification. Alabama Coarse of Study. Content Standards 3. Throughout this semester, I feel, I have accomplished teaching the science concepts I intended to teach.

Archimedes : Greek mathematician, physicist, engineer, inventor and astronomer c. In other words, the buoyancy is equal to the weight of the displaced fluid. For example, when an object goes into water, it displaces the water. EDinformatics Mass, Volume, Density.

ProTeacher Collection Density. Objectives Demonstrate how the distribution of molecules in a substance determines its density.

Investigate the relative densities of liquids and the relative densities of solids. Demonstrate understanding of the relationship between density and buoyancy by building a boat.

Materials see individual activities for materials. There are a few possibilities: Atoms of one substance might be a similar size yet have more mass than the atoms of another substance. Atoms of one substance might be a similar mass but be smaller, so more of them fit within the same volume. Atoms of one substance might be arranged in a way that allows more of them to fit in the same volume.

There are two possible ways to make that object float, however: Increase the density of the water so that the water becomes denser than the object. For example, an egg will usually sink in a glass of water, because it is denser than water.

Adding salt to the water increases the density of the water, allowing the egg to float. This experiment also works with people, but you need a lot of salt try the ocean, or even better, the Dead Sea! Increase the volume of the object so that the object becomes less dense than the water. A great example of this is ice floating in water. Ice is formed by freezing water.

When it freezes, it increases in volume as the water molecules move farther apart to accommodate the lattice structure of ice. If there are, ask your child to explain them. The explanation Most children and quite a few grown-ups!

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