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Glossary of Terms > N

Neutrons

Subatomic particles found in the nuclei of atoms. Have no overall charge and a relative mass of 1.

Newton's First Law

An object at rest will remain at rest unless acted upon by an external and unbalanced force. An object in motion will remain in motion unless acted upon by an external and unbalanced force.

Newton's Second Law

The rate of change of momentum of a body is proportional to the resultant force acting on the body and is in the same direction.

Newton's Third Law

All forces occur in pairs and these two forces are equal in magnitude and opposite in direction.

Nucleus (atomic)

The nucleus of an atom is the very small dense region, of positive charge, in its centre consisting of nucleons (protons and neutrons).