Intermolecular forces of attraction prevent ice cubes from adopting the shape of their container,intermolecular forces are overcome when ice melts,intermolecular forces are overcome when liquid water is vaporized and for conversion to hydrogen and oxygen gas intramolecular forces are overcomed.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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