In 1784, George Atwood invented a device called an Atwood machine. We use it for the measurement of acceleration of gravity, but this device can originally change gravity to suffer from into an object by adding a difference to mass of an object to hang at both ends of a device. Therefore we produced an Atwood machine in this study and really experimented on a fall and performed the experiment that considered various factors such as the moment of inertia of a pulley in fall distance and fall time and inspected the acceleration that acted on an object. Furthermore, we examined possibility of observation of the physical phenomena of variety in the minute gravity bottom where we used this device.