📚 Part 1: Understanding Density and Pressure

1. What is the formula for density?

Density = Mass + Volume

Density = Mass ÷ Volume

Density = Volume ÷ Mass

Density = Mass × Volume

2. A rubber ball has a mass of 50 grams and a volume of 25 cubic centimeters. What is its density?

Answer: _________ g/cm³

3. What happens to fluid pressure as you go deeper underwater?

Pressure decreases

Pressure increases

Pressure stays the same

Pressure disappears

4. Which factors affect whether an object will sink or float? (Check all that apply)

The object's density

The fluid's density

The object's color

The fluid's temperature

5. How does temperature affect the density of water?

Warmer water is more dense than cold water

Warmer water is less dense than cold water

Temperature doesn't affect water density

Only freezing changes water density

🔬 Part 2: Experiment Analysis

6. During our experiment, you tested a ball in fresh water, salt water, and warm water. Complete the data table below:

Ball mass: _______ grams Ball volume: _______ cm³

Ball density: _______ g/cm³

7. Explain why the ball behaved differently in salt water compared to fresh water.

8. A submarine needs to dive deeper into the ocean. What happens to the water pressure on the submarine's hull as it goes from 50 feet deep to 200 feet deep?

🌊 Part 3: Real-World Applications

9. Why do deep-sea fish have special adaptations to survive at great depths?

10. An ice cube floats in water. Using what you learned about density, explain why this happens.

11. Fill in the blanks: When water is heated, its density _________, which makes it _________. This is why hot water _________ and cold water _________.

Word bank: decreases, increases, rises, sinks