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This is called Triboelectricity (tribo means friction).
A sound is produced when a metal blade called a tangent strikes the string.
only certain types of metal
The metal part of a pencil is called a ferrule.
Threshold frequency (fo) is minimum frequency at which electrons are ejected from a metal.
Newton's Cradle.
Newton's Cradle
Bearings reduce friction by providing smooth metal balls or rollers, and a smooth inner and outer metal surface for the balls to roll against. The smoothness of the metal reduces the friction and the surface area.
mace
A musket fires small metal balls (back then made of lead) called musket balls (simple enough:)
Rub my metal balls or rubber balls.
Metal wheels or the large Balls. They are 2 different types of things.
No
bla bal bla
The original barbell must be metal. After that...it's your preference. I don't like plastic barbells because they aren't as sturdy. However, I do like to use plastic balls instead of metal. The metal click against my teeth and can be more damaging.
Close. It is BOULES.
I'm sorry, but that cannot be called metal, as the sound resembles bam's balls being cut off.