Is the weight of an object and weight of water displaced by it equal ? in Floating bodies – Class 9 Science Experiment

Chapter Name: Floating bodies

Activity Name: Is the weight of an object and weight of water displaced by it equal ? in Floating bodies

Activity Description:

Is the weight of an object and weight of water displaced by it equal ? in Floating bodies - Class 9 Science Experiment

The experiment aims to investigate whether the weight of water displaced by an object placed in a container is less than, equal to, or more than the weight of the object itself.

This experiment will be conducted with a wooden block and later repeated with various other substances that float or sink.

Required Items:

  1. Beaker
  2. Overflow jar
  3. Weighing balance
  4. Wooden block
  5. Water
  6. Other substances that float or sink (e.g., plastic bowl, ball, steel container, fruits, etc.)
  7. Weights for the weighing balance

Step by Step Procedure:

  1. Weigh the empty beaker and note down its weight.
  2. Fill the overflow jar with water and wait until it stops dripping from the outlet.
  3. Place the beaker below the outlet of the overflow jar.
  4. Moisten the wooden block with water and gently drop it into the overflow jar, making sure not to forcefully submerge it or block the outlet.
  5. Observe as water flows out of the overflow jar and collects in the beaker.
  6. Make a guess: Do you think the weight of the water displaced by the wooden block will be less than, equal to, or more than the weight of the wooden block?
  7. Place the beaker containing the displaced water on one pan of the weighing balance.
  8. Take the wooden block, wipe it to remove excess water, and place it on the other pan of the weighing balance along with weights equal to the weight of the empty beaker.
  9. Check if the two pans of the weighing balance balance out.

Experiment Observations:

  1. Record whether the two pans of the weighing balance balance out or not when comparing the weight of the water displaced and the wooden block for each material used.
  2. Note down observations for each substance tested (e.g., wooden block, plastic bowl, ball, steel container, fruits, etc.) in Table 4.
Is the weight of an object and weight of water displaced by it equal ? in Floating bodies - Class 9 Science Experiment

Precautions:

  1. Ensure the wooden block is moistened with water before dropping it into the overflow jar.
  2. Do not forcefully submerge the wooden block or allow it to block the overflow jar’s outlet.
  3. Be cautious while handling the beaker and other items to avoid spillage or accidents.

Lesson Learnt from Experiment:

This experiment helps to understand the principle of buoyancy, which states that the weight of the water displaced by an object is equal to the weight of the object when it is floating in the water. If the object sinks, the weight of the displaced water will be less than the weight of the object, and if the object floats, the weight of the displaced water will be equal to the weight of the object.

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