Consider an object that floats in water but sinks in oil. When the object floats in a glass of water, half of the object is submerged. We now slowly pour oil into glass so it completely covers the object.. Compared to water level, does the object move up, move down, or stay in same place.
I think i understand that for the object to float in water, the bouyant force exceeds the density of the water.. or that the object is less dense than water, but more dense than oil.
I know that for an object to float it has to displace more water than its weight. However, when oil is added to the top of the water, does it prevent the object from displacing the water- in effect causing it to sink?