1. The visionary attempts to use gravity as the driving force, but does not consider the influence of gravity on the small magnet. The position of the small magnet under gravity does not exhibit a symmetrical state.

2. By calculating the torque of the system, it is shown that if M=0, the runner stops at a certain position and will not continue to move.

3. According to the First law of thermodynamics of thermodynamics, Q=△ E+A, part of the heat absorbed by the system is converted into the internal energy of the system, and part is converted into the external work of the system. During the entire hypothetical motion process, if the magnet repels and pushes the compression spring, it will consume energy, and if the spring returns, it will release energy. The center of gravity of the system remains unchanged, and gravity does not do work. There is no energy change in the overall process, Δ E=0. If there is no external absorption of heat Q, then (A=0) cannot do external work. So this device cannot achieve permanent motion and perform external work.

4. Iron is divided into permanent magnets and non permanent magnets. Permanent magnets do not always have magnetism, and external factors can change their magnetism, such as high temperature, impact, strong magnetic fields, and the magnetic field generated by surrounding alternating current, which can cause the magnetic body to demagnetize. Therefore, no matter which type of magnet is used, it cannot provide permanent magnetism. The continuous effect of magnetic force on the magnet leads to a decrease in magnetism. When the magnetic force is insufficient to push the spring, the device stops moving.