Did you complete the reading assignment?
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KEY CONCEPTS:
1) Buoyant force
replaces the normal force when an object rests on a fluid instead of a
solid.
2) Archimedes' principle relates buoyant
force to mass of displaced fluid.
Archimedes' principle states that an object submersed in a fluid (partially
or completely), is buoyed up by a force which is equal to the weight of the
fluid
Go to:
http://www.walter-fendt.de/ph11e/buoyforce.htm. The right side of the
applet allows you to change a few of the parameters of the mass, spring, and
liquid. The 'Measuring Range' option just changes what you can measure,
change it to 2000 N now so that it will not limit anything else you do in
the applet. You can also see the weight of the mass, how much volume of
liquid is replaced, the buoyant force acting on the mass, and the force of
tension from the spring scale at the right side of the applet.
Drag the mass into the water with the mouse. How are the buoyant force,
weight of the mass, and measured force of tension in the spring scale
related?
Now change the base area of the mass to 50 cm2 and the height to
10 cm so the mass has the same volume but a different shape. Does changing
the shape of an object affect the buoyant force acting on it?
Yes
No
Now drag the mass so that only about half of it is submerged in the liquid. Does
this change the buoyant force acting on the mass? Why or why not?
Submerge the entire mass again. Increase the density of the mass. How does this
affect the buoyant force?
Increases buoyant force
Decreases buoyant force
Does not change buoyant force
Now increase the density of the fluid (keep it less than the density of the
mass). How does this affect the buoyant force?
Increases buoyant force
Decreases buoyant force
Does not change buoyant force
Now make the density of the mass and fluid the same. How are the buoyant force,
weight of the mass, and measured force of tension in the spring scale related
when the densities of the fluid and mass are the same?
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