What makes objects Float
As a child, you may have played with objects in the bathtub, noticing that the bar of soap sank to the bottom of the water while the plastic soap dish floated on top. Why it is than many objects, ranging from a piece of cork to an ocean liner, will float, while others will not?
The force that makes objects float is called buoyancy. This concept was established by the great Greek mathematician Archimedes, who also played in the bathtub. Archimedes observed that when he got into his bathtub, water was displaced, or pushed out. He determined that any object immersed in a liquid is buoyed up a force equal to the weight of the fluid displaced by the object. This is known as Archimedes’ principle. For example, suppose a rock weighs 100 pounds and has
a volume of I cubic foot . When the rock is submerged in water, it displaces I cubic foot of water, which weighs 62 pounds. Therefore, the gravitational pull on the rock is 100 pounds downward and the buoyant force is 62 pounds upward. Out of the water, you would need to exert a force of 100 pounds to lift the rock. In the water you would have to exert a force of 100 minus 62 pounds (or 38 pounds).
What makes objects FloatAs a child, you may have played with objects in the bathtub, noticing that the bar of soap sank to the bottom of the water while the plastic soap dish floated on top. Why it is than many objects, ranging from a piece of cork to an ocean liner, will float, while others will not?The force that makes objects float is called buoyancy. This concept was established by the great Greek mathematician Archimedes, who also played in the bathtub. Archimedes observed that when he got into his bathtub, water was displaced, or pushed out. He determined that any object immersed in a liquid is buoyed up a force equal to the weight of the fluid displaced by the object. This is known as Archimedes’ principle. For example, suppose a rock weighs 100 pounds and has a volume of I cubic foot . When the rock is submerged in water, it displaces I cubic foot of water, which weighs 62 pounds. Therefore, the gravitational pull on the rock is 100 pounds downward and the buoyant force is 62 pounds upward. Out of the water, you would need to exert a force of 100 pounds to lift the rock. In the water you would have to exert a force of 100 minus 62 pounds (or 38 pounds).
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