Taking it further:

1. Tell the students to try other materials and shape for the diver. Try to use small container (like catsup container for kids) as a diver.

2. Try pressing the bottle simultaneously (press-release) and observe the reaction of the diver.

3. Ask the students to explain the concept using Buoyancy.

1. Cut the drinking straw and bend it in U-shape.

2. Use the paper clip to join both ends of the straw. This serves as your diver. Optional: You can connect additional paper clips on the diver.

3. Fill the bottle with water until on its top.

 

4. Test the floating ability of the diver. Put water on the straw and dip immediately in the water. If the diver floats at top of the water, add water on the straw or add paper clip. If the diver sinks, remove water or removed the additional paper clip.

5. When the diver is just barely floating, put it on the bottle; be careful not to let the water on the straw drop. Close the bottle tightly.

6. Press the bottle in the middle. The diver should goes down. Release the bottle and the diver goes up.

PROCEDURE:

· Plastic bottle

· Pot of water

· Drinking straw

· Paper clips (you can use colored paper clips)

· Scissor