Buoyancy

1. Buoyancy What is buoyancy? The ability to float.

2. Buoyancy What is buoyancy? “Any body wholly or partially immersed in a fluid experiences an upthrust equal to, but opposite in sense to, the weight of the fluid displaced.” Archimedes Principle The ability to float.

3. Buoyancy Forces in Action Buoyancy: upward force on an object Gravity: downward force on an object Pressure: force all around an object Gravity The ability to float. Pressure Pressure Buoyancy

4. Buoyancy Finding the Balance When there is a balance between the buoyant force and the force of gravity the object is said to be neutrally buoyant. The key is to make an ROV that is as close to neutrally buoyant as possible, or the buoyant force should be slightly more than the force of gravity (to prevent sinking). The ability to float.

5. Buoyancy Types of Buoyancy Positively Buoyant Neutrally Buoyant Negatively Buoyant

6. Buoyancy Ballast Dynamic (soft): system that changes the amount of water displace inside the ballast chamber. Static: ballast chamber does not change. ROV is designed to be neutrally buoyant and motors move it up and down. The volume of air stays the same.

7. Balance Center of Mass Build an ROV Interactive: http://www.mysticaquarium.org/fun-and-learning/games/302-build-an-rov

8. Frame Construction Buoyancy and Balance Let’s do an experiment!

9. Frame Construction Buoyancy and Balance Let’s make this positively, neutrally, and negatively buoyant! Let’s make this float!