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Weight
 
Cartoon airplane flying in a cloudy sky with red arrows pointing down with the word WEIGHT on each of them

Just like a person's body, an airplane's weight is pulled downward toward Earth. Image Credit: NASA

      the measure of the pull of gravity on an object




Sentence:
NASA astronauts do not feel the effect of gravity in space, which makes them seem like they have no weight, or feel weightless.



More Information:
http://exploration.grc.nasa.gov/education/rocket/rktwt1.html   →
http://scifiles.larc.nasa.gov/text/kids/Problem_Board/problems/flight/weight2.html   →