sentences: a paper clip is a kind of object & a paper clip is often made of magnetic metals / ferromagnetic metals ->  a paper clip is an object made of magnetic metals  a paper clip is an object made of magnetic metals & a magnet attracts magnetic metals / ferromagnetic metals through magnetism ->  a magnet will attract a paper clip through magnetism  non-contact forces can affect objects that are not touching & magnetism can affect objects that are not touching / without contact ->  magnetism is a kind of non-contact force  a magnet will attract a paper clip through magnetism & magnetism is a kind of non-contact force -> a magnet attracting a paper clip is an example of non-contact force affecting an object