# Let us measure the force of buoyancy in Floating bodies – Class 9 Science Experiment

## Activity Name: Let us measure the force of buoyancy in Floating bodies

### Activity Description:

In this experiment, we will measure the force of buoyancy acting on a stone when it is immersed in water. By using a spring balance, we will first measure the weight of the stone outside the water and then the apparent weight of the stone when immersed in water. Additionally, we will measure the weight of the water displaced by the immersed stone.

### Required Items:

1. Stone
2. Spring balance
3. Beaker half-filled with water

### Step by Step Procedure:

1. Suspend the stone from a spring balance and note down the reading of the spring balance. This reading gives the weight of the stone.
2. Take a beaker half-filled with water.
3. Immerse the stone in the water and note down the reading of the spring balance. This reading gives the apparent weight of the immersed stone.
4. Measure the weight of the water displaced by the immersed stone using a suitable measuring instrument.

### Experiment Observations:

1. The initial reading of the spring balance gives the weight of the stone outside the water.
2. The reading of the spring balance when the stone is immersed in water gives the apparent weight of the immersed stone.
3. The weight of the water displaced by the immersed stone is measured.

### Precautions:

1. Ensure the stone and the spring balance are clean and dry before starting the experiment.
2. Handle the stone and the beaker carefully to avoid any damage or spills.
3. Take accurate readings from the spring balance and the measuring instrument for precise results.

### Lesson Learnt from Experiment:

The experiment demonstrates the concept of buoyancy and how it affects the weight of an object when immersed in a liquid. When an object is immersed in a liquid, it appears to lose some weight due to the upward force of buoyancy acting on it. The apparent loss of weight is equal to the force of buoyancy exerted on the object by the liquid.

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