The words weight, fly and sand have "fly" in common, because together they can form other words. Their direct relationship is: fly, fly weight, and sand fly.
weight fly sand
a fly is not an element so it does not have an "atomic" weight. It does have a mass or weight however
An airplane produces enogh lift to fly with weight. Cargo planes are designed to do that.
Paper is what weight, fly, and sand have in common. Paperweight, flypaper, and sandpaper is how paper is common for all of them.
It is a weight that you put on papers so they fly around.
Just adding weight will not make a paper airplane fly farther. However, adding weight in exactly the right places can make it fly farther, by improving its balance and stability.
The words weight, fly, and sand are all nouns. The words can all be used as the subject in a sentence.
The weight will move, but, it won't "fly" in the traditional meaning of the word.
They didn't. They are fictional.
A boxer that can fly-a-weight, get it?!?!?!?!
They do not carry much weight - if they did, they wouldn't be able to fly. Everything about their bodies and way of life is aimed at low weight and high strength in the flight muscles.