Lenz' Law

A horseshoe magnet hangs on two thin ropes.
If you deflect the magnet, it can vibrate without rubbing against the coil.
Due to the air friction, the magnet is slowed down a bit, but hardly noticeable.
If the ends of the coil are connected, you can observe the following:
The magnet comes to rest much faster.
Explanation: 1. Due to its movement, the magnet induces a current in the coil.
Explanation: 2. Since the circuit is closed, the electrons can flow and generate another magnetic field.
Explanation: 3. This generated magnetic field is responsible for the deceleration.
To better observe this magnetic field, we look inside the coil during this process.
The magnetic field (clarified with force field lines) changes its direction, depending on the movement of the magnet.
Each time, the magnetic field slowes down the movement of the magnet.
This is stated by Lenz's Law.
Translation: "The direction of the current induced is such, that the magnetic field created opposes the initial magnetic field."
The cause is the movement of the magnet. Consequently, the magnetic field acts against this movement.
The movement is slowed down!