13-04-2012, 03:38 PM
BUOYANCY FLOATING AND SINKING
[attachment=20096]
Archimedes' Principle
When an object is completely or partially immersed in a fluid, the fluid exerts an upward force on the object equal to the weight of the fluid displaced by the object.
When a solid object is wholly or partly immersed in a fluid, the fluid molecules are continually striking the submerged surface of the object. The forces due to these impacts can be combined into a single force the buoyant force. The immersed object will be “lighter” i.e. It will be buoyed up by an amount equal to the weight of the fluid it displaces.
Partially submerged
Answer A The cups weight the same. Assume static
equilibrium, then weight of the ice cubes is equal to the
buoyant force. The buoyant force is equal to the weight of
the water displaced by the ice cubes. This means that the
weight that the ice cubes add to the cup is exactly what an
amount of water that is equal to that submerged volume of
ice cubes would add.
When an object is floating in a fluid, the fluid
exerts an upward force on the object called the buoyancy force. This
buoyant force is equal to the weight of the fluid displaced by the body
[attachment=20096]
Archimedes' Principle
When an object is completely or partially immersed in a fluid, the fluid exerts an upward force on the object equal to the weight of the fluid displaced by the object.
When a solid object is wholly or partly immersed in a fluid, the fluid molecules are continually striking the submerged surface of the object. The forces due to these impacts can be combined into a single force the buoyant force. The immersed object will be “lighter” i.e. It will be buoyed up by an amount equal to the weight of the fluid it displaces.
Partially submerged
Answer A The cups weight the same. Assume static
equilibrium, then weight of the ice cubes is equal to the
buoyant force. The buoyant force is equal to the weight of
the water displaced by the ice cubes. This means that the
weight that the ice cubes add to the cup is exactly what an
amount of water that is equal to that submerged volume of
ice cubes would add.
When an object is floating in a fluid, the fluid
exerts an upward force on the object called the buoyancy force. This
buoyant force is equal to the weight of the fluid displaced by the body