The resistance of moving surfaces produces friction.
Friction always results in a loss of energy in the form of heat which enters the atmosphere.
True.
Oil or water clinging to a surface of a jar is an example of...
The last one I believe is either fraction or adhesion.
<h2>Answer: Ion
</h2>
An ion is an atom that is electrically charged by <u>gaining or losing one or more electrons.
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To understand it better:
An atom has a nucleus with electrons around it and has a neutral charge. When an electron is added or detached, this atom is electrically charged, that is, it ceases to have a neutral charge and becomes an <u>ion</u>.
In this sense, there are two types of ions:
-Anions: ions negatively charged, by the gain of electrons in the atom.
-Cations: ions positively charged, by the loss of electrons in the atom.
Elastic Potential Energy because the elasticity in the string stores up the energy.
