Here's how it works:
* Inertia: Inertia is the tendency of an object to resist changes in its state of motion. This means an object at rest wants to stay at rest, and an object in motion wants to stay in motion at a constant speed and direction.
* Seismograph Structure: A seismograph has a heavy weight suspended by a spring. The weight is attached to a pen that records on a rotating drum or a digital sensor.
* Earthquakes and Inertia: When an earthquake occurs, the ground shakes. The seismograph's base is attached to the ground, so it moves with the shaking. The heavy weight, however, due to its inertia, tries to stay in its original position.
* Recording the Movement: This difference in movement between the weight and the base causes the pen to move relative to the paper on the drum, or the sensor to record the movement digitally. The pen traces a line on the paper, recording the intensity and duration of the earthquake.
In essence, the seismograph uses the inertia of the heavy weight to isolate and record the ground's movement during an earthquake.
