the goal:

- Explaining the relationship between buoyant force, weight of an object in air, and its apparent weight in water.

- Applying the Archimedes' principle to buoyancy.

- Inferring the effect of surface area and known mass density on the amount of water displaced.

Materials and tools:

Different weights - A cup filled with water - A spring balance

Steps:

1- Place a quantity of water in the container and carefully observe the volume of the water from the graduations on the container.

2- Attach a mass of 500 grams to the end of the spring balance, then measure the weight of the mass in the air and record this value.

3- Submerge this mass in water and measure its weight while it is submerged in the water and record the results.

4- Repeat the previous steps with a mass of 100 grams and record the results. 

Note:

We notice that the weight of the object in water is less than its weight outside of water. 

Conclusion:

The Archimedes' principle states that a body that is fully or partially submerged in a fluid is acted upon by an upward vertical force equal in magnitude to the weight of the fluid displaced by the body. 

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