Construct a buoyancy toy as shown on the left. These can be purchased from Dynamic Science Education(see the front page of this web site under products).
Click to see a 120kb video of the toy.
A water droplet coloured green is falling through olive oil.
What can you say about the mass of olive oil displaced by the water droplet when compared to the mass of the water droplet?
What forces
are acting on the water bubble as it sinks deeper into the olive oil?
"The water bubble sinks with a constant speed so there must
be no upward force acting on the bubble." Is this comment true?
Explain
Water bubbles traveling through baby oil travel quicker , than when traveling through olive oil. Why? Click to see a 120kb video.
"Since the water bubble sinks faster in baby oil the downward force acting on it is greater than in olive oil." Is this comment true? Explain.
Does the buoyant force acting on the water bubble increase as it sinks deeper into the baby oil? Explain.
A plastic toy bear was placed in the density toy and floats on top of the blue water layer. The clear liquid is parafin oil.
When the same toy bear is placed in water and air it sinks. Explain why
Hint- compare the buoyant force exerted in air and in oil.
