Magnet
A horseshoe magnet with the letter N on one end and the letter S on the other

Horseshoe magnets are the easiest kind of magnet to recognize. Image Credit: NASA

      a material or object that produces a force that pulls on other magnetic materials




Sentences:
NASA's Mars Pathfinder used magnets to collect dust from the air on Mars.

We used a magnet to pick up the sewing needles that dropped from the package.



More Information:
http://ksnn.larc.nasa.gov/k2/s_magnetsWork.html   →
http://ksnn.larc.nasa.gov/webtext.cfm?unit=electromagnet   →