What is Buoyancy?
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Transcript of What is Buoyancy?
Buoyancy
Roads, Rails and Race cars
What Forces act on a Boat?
Gravity
Buoyancy
Buoyancy Definition
• The force on a body that allows it to float or to rise when submerged in a fluid
• The buoyant force exerted on an object by a fluid is equal to the weight of the fluid the object displaced
Fun Tips
• Buoyancy always acts through the center of the volume of the object displacing the fluid
• The center of mass of the boat should be well below the center of submerged volume of the boat to prevent the boat from tipping– This can be demonstrated with a tall bobber and a
weight. If the weight is mounted on the top of the bobber, the bobber will tip upside down. If it is mounted on the bottom, it will stay upright.
Videos
• http://www.youtube.com/watch?v=gh5xu35bAxA
• https://www.youtube.com/watch?v=FSGeskFzE0s
Activity – Penny Boats• Construct your penny boat using only one piece of
the heavy duty aluminum foil provided• Predict how many pennies your boat will hold:
_______• Slowly add pennies to your boat. Once water
enters the boat, or if any part of the boat touches the bottom of the container, your turn is over
• The last penny added will not count in the total amount held