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Buoyancy and the Archimedes Force

**Purpose: To investigate the force exerted by a fluid on a submerged object. **

**Objectives**

- To learn how to measure the buoyancy force on a submerged object.

**Equipment**

- Graduated cylinders
- A metal object
- Mass Scale

**Theory**

When an object is submerged in a fluid it displaces fluid volume equal to its own volume.

The force exerted by the fluid on a submerged object is equal to the weight of the displaced fluid and is called the Archimedes force.

** (Buoyancy Force) = (fluid density) ×(the gravitational acceleration) × (Displaced Volume) **

**Experiment, Data and Results**

We will calculate the buyoancy force in two different ways and compare the value

**Activity 1:** Determine the buoyancy force by measuring the displaced volume

- Fill the graduated cyllinder with water and mark the water level.
- Submerge the metal object and mark the new water level.
- Determine the displaced volume and calculate the buoyancy force.

**Activity 2: Determine the buoyancy force by measuring the mass and the apparent mass**

Measure the mass of the object.

Submerge the object in water and measure its mass>

Calculate the boyancy force.

**Questions.**

Do the two values for the buoyancy force agree?

Which method do you think is more accurate. Justify your arguments.