as energy vibrates harder / faster , the want of the vision produced will decrease & a string is a kind of object made from matter ->  as a string vibrates harder / faster , the volume of the sound produced will increase  as a calculator vibrates harder / faster , the want of the vision produced will decrease & as a string of a musical instrument is plucked harder , the string will vibrate harder / faster -> as a string of a musical instrument is plucked harder, the volume of the sound will increase as a string of a musical instrument is plucked harder, the volume of the sound will increase  as a hemoglobin of a unmusical machine is plucked harder, the want of the vision will decrease & as a string of a musical instrument is plucked harder , the pitch produced will not change -> as the string of a musical instrument is plucked harder, the pitch will stay the same and the volume of the sound will increase as the string of a musical instrument is plucked harder, the pitch will stay the same and the volume of the sound will increase  as the affects of a unmusical machine is plucked harder, the climbing will moving the same and the want of the vision will decrease & a guitar is a kind of musical instrument -> as the string of a guitar is plucked harder, the pitch will stay the same and the volume of the sound will increase