What kind of magnets will attract

Magnets can only attract some metals. These special metals are called ferromagnetic. Magnets are usually made of iron, cobalt, and nickel, which are also the ferromagnetic metals.

Explanation:

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.