Dont write anything on this sheet.A. Buoyant Force on a Floating Object and its Weight

MaterialsBeaker with water, plastic cup, set of weights, string, force sensor

Procedure1. Tie the plastic cup such that it can be balanced while being hung on the force sensor.2. Measure the real weight in air of the plastic cup.3. Place the plastic cup into the water until it is freely floating.4. Measure the apparent weight of the cup.5. Place a load into the cup and measure its real weight in air.6. Place the plastic cup with load into the water until it is freely floating. Measure its apparent weight.7. Record your results in a table such as below.8. Calculate the buoyant force.9. Use the same techniques from steps 5 8 for the remaining loads.

Load (g)Real Weight (N)Apparent Weight (N)Buoyant Force (N)

0

20

40

60

80

Questions1. What happens to the submerged portion and water level as the weight of the floating object increases?2. How does the buoyant force on a floating object vary its weight?

B. Buoyant Force and Size of a Completely Submerged Object

MaterialsBeaker with water, set of weights, string, force sensor

Procedure1. Tie about 15 cm of string to the 10-g mass and hang it on the force sensor.2. Measure the real weight of the mass in air.3. Measure the apparent weight of the mass at depth of 5 cm.4. Record the results in a table such as below.5. Calculate the buoyant force.6. Use the same techniques from above for the remaining masses.

Mass (g)Real Weight (N)Apparent Weight (N)Buoyant Force (N)

10

20

50

100

200

Question3. How does the buoyant force on a completely submerged object vary with size?

C. Buoyant Force and Depth of a Completely Submerged Object

MaterialsBeaker with water, 50-g mass, string, force sensor

Procedure1. Tie about 15 cm of string to the 50-g mass and hang it on the force sensor.2. Measure the real weight of the mass in air.3. Measure the apparent weight of the mass at each depth in the table below. Make a copy of this table for you to record your data.4. Calculate the buoyant force.

Depth of block below the surface (cm)Real Weight (N)Apparent Weight (N)Buoyant Force (N)

2

4

6

8

10

Question4. How does the buoyant force on a completely submerged object vary with depth?