They bend because they are flexible. They're flexible because they have a rubber polymer base that allows the graphite core to flex with the rubber exterior.
Ductility is "The ability to bend or flex". Stiffness, rigidity, and hardness come to mind. If a metal is hard it isn't Ductile.
Because our ancestors were arboreal, and we've retained enough of those instincts to intuitively know to lower our center of gravity when jumping down and flex our legs on landing to cushion the impact.
The word 'flex' is a noun as well as a verb. The noun flex is a word for pliancy. Example sentences: Verb: The pianist had to flex his fingers before each performance. Noun: Bridges of concrete and steel appear to be rigid but a great deal of flex is built into them. The noun forms for the verb to flex are flexibility and the gerund, flexing.
dangerous bend
To bend
flex, or bend
The prefix that means to bend is "flex-."
Flex.
your joints help your fingers bend and flex
"Flex" in Latin can mean "bend" or "to curve." It is often used in words related to flexibility or bending, such as "flexibilis" meaning flexible.
bend, tighten, contract
skill
A beam that will not flex or bend - eg an I beam.
It isn't Greek. Flex actually comes from the Latin word for 'bent.'
a muscle that serves to flex or bend a part of the body.
Flex your foot