Eddy currents are produced in this solid piece of copper when a strong magnet falls towards it, 
changing the magnetic flux through the copper. 
This induces an emf which drives eddy currents which produce a magnetic field to oppose the change in flux.
The repulsive force exerted on the falling magnet reduces its acceleration downwards and it lands gently.
If the same magnet is pulled along above the surface of the copper, 
 the change in magnetic flux which occurs as the magnet moves sideways induces eddy currents in the copper. 
These eddy currents experience a force due to the motor effect, dragging the copper along on the rollers.
In electromagnetic braking there is a change in magnetic flux through the wheel as it moves past the magnet. 
This induces eddy currents at the leading and trailing edge of the part of the wheel in the magnetic field,
 as this is where the magnetic flux is changing.
The parts of the eddy currents in the field experience a force due to the motor effect
 in the direction opposite to the rotation, slowing the wheel down.
