Can we measure the weight of free-fall body in Gravitation – Class 9 Science Experiment

Chapter Name: Gravitation

Activity Name: Can we measure the weight of free-fall body in Gravitation

Activity Description:

Can we measure the weight of free-fall body in Gravitation - Class 9 Science Experiment

In this experiment, we aim to investigate the changes in the reading of a spring balance when it is used to measure the weight of an object under two different instances: first, when the object is stationary, and second, when the object is allowed to fall freely from a certain height.

Required Items:

  • Spring balance
  • Load (weights)
  • Ceiling or support to suspend the spring balance
  • A height from which the load can fall freely

Step by Step Procedure:

  1. Suspend the spring balance from the ceiling or support in a stable manner.
  2. Place the load (weights) on the spring balance and note the reading indicated by the spring balance.
  3. Hold the loaded spring balance at a certain height and release it, allowing it to fall freely.
  4. Carefully observe the position of the indicator on the spring balance scale while it is in free-fall.
  5. Record the reading of the spring balance during free-fall.

Experiment Observations:

  1. The reading of the spring balance when the load is stationary.
  2. The reading of the spring balance during free-fall.


  1. Ensure the spring balance is securely suspended to avoid accidents.
  2. Use appropriate safety measures when dropping the load from a height.
  3. Make sure the surface below the free-fall area is clear and free from obstructions.
  4. Take multiple readings to ensure accuracy.

Lesson Learnt from Experiment:

The experiment aims to demonstrate that the readings of the spring balance are different in the two instances. When the object is stationary, the spring balance measures its weight as per the force of gravity acting on it.

However, during free-fall, the spring balance indicates zero weight. This happens because both the object and the spring balance are falling with the same acceleration due to gravity. As a result, the spring balance does not register any weight during free-fall.

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