Buoyancy
What is the relationship of the buoyant force and the mass of the water being displaced?

Equipment.

Displacement container
Foam cup
Sand
Spring balance (3N)
110mL measuring cylinder.
200mL Beaker
Electronic balance
Ruler

Use a ruler to mark the side of the cup at 2 cm intervals as shown on the right.
Tie a string to the cup as shown on the right.
Measure the weight of the cup filled with sand using the 3N spring balance.
Fill the displacement container to the brim with water as shown on the right.
Submerge the cup to the first 2cm mark and collect the water that flows out in a beaker. Record the reading on the spring balance.
Weigh the water that was displaced with an electronic balance.
Depth of cup submerged (cm) Weight recorded on the spring balance(g) Volume of water displaced (cm3) Weight of water displaced(g)
Weight of sand before been submerged.
2
4
6
8
10
Is there a relationship between the weight of the submerged sand and the mass of water displaced?
Is there a relationship between the volume and the mass of the water displaced?
Repeat the above experiment with salty water prepared by dissolving as much salt in hot water as possible.
Does the same relationship between the weight of the submerged sand and the mass of water displaced still exist? Explain.