Larger the net force greater the acceleration in Laws Of Motion – Class 9 Science Experiment

Chapter Name: Laws Of Motion

Activity Name: Larger the net force greater the acceleration in Laws Of Motion

Activity Description:

Larger the net force greater the acceleration in Laws Of Motion - Class 9 Science Experiment

In this experiment, we will investigate the relationship between net force and acceleration by gently pushing a block of ice on a smooth surface and then increasing the net force to observe how the object’s speed (acceleration) changes.

Required Items:

  1. Block of ice
  2. Smooth surface
  3. Measuring tape or ruler
  4. Stopwatch or timer

Step by Step Procedure:

  1. Place the block of ice on a smooth surface, ensuring there is enough space for it to move freely.
  2. Gently push the block of ice in a horizontal direction, applying a small net force, and note the initial speed of the object.
  3. Use a stopwatch or timer to measure the time it takes for the block of ice to cover a certain distance (e.g., 1 meter) from its initial position.
  4. Calculate the initial acceleration of the block of ice using the formula: Acceleration = (Change in Speed) / (Time taken)
  5. Now, increase the net force applied to the block of ice by pushing it harder but maintaining the same smooth surface.
  6. Again, note the new speed and measure the time taken for the block of ice to cover the same distance as before.
  7. Calculate the new acceleration of the block of ice with the increased net force.

Experiment Observations:

  1. The block of ice will speed up (accelerate) when a small net force is applied.
  2. With the increased net force, the block of ice will experience a higher acceleration, covering the same distance in a shorter time.


  • Ensure that the surface is smooth and free from any obstacles to avoid any unintended frictional forces.
  • Handle the block of ice with care to prevent any injuries or damage.
  • Use gentle pushes initially to avoid excessive acceleration and ensure safety.
  • Keep the experiment area clean and tidy to avoid any accidents.

Lesson Learnt from Experiment:

The experiment demonstrates Newton’s second law of motion, which states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass.

When the net force on the block of ice is increased, the acceleration also increases, resulting in a higher speed in a given time. This experiment helps to understand the fundamental concept of force and its relationship with acceleration.

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