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1st Semester Vocab.

Review all the vocabulary from the 1st semester.

atoms basic unit of a chemical element
elements a substance that cannot be broken down by chemical mean
nucleus The core or the central part around which other parts are grouped or gathered.
electron shells a grouping of electrons surrounding the nucleus of an atom
protons a stable subatomic particle with a positive charge
neutrons a subatomic particle of about the same mass as a proton but without an electric charge
electrons a stable subatomic particle with a charge of negative electricity
atomic number the number of protons in the nucleus of an atom
atomic mass the mass of an atom of a chemical element expressed in atomic mass units, equal amount to protons and neutrons.
valance electrons the outer shell of an atom which can combine with other atoms to form molecules
speed refers to "how fast an object is moving."
velocity refers to "the rate at which an object changes its position."
acceleration increase in the rate or speed of something
force a push or a pull, strength or energy as an attribute of physical action or movement
balanced force the forces pushing (or pulling) an object in one direction are the same size as the forces acting in the opposite direction.
unbalanced force refers to a force that together can equal a certain number and will make a change of the object's motion.
direction a course along which someone or something moves.
Newton's 1st law an object at rest stays at rest. an object in motion stays in motion unless force is acted upon it.
Newton's 2nd law sum of the forces on an object is equal to the total mass of that object multiplied by the acceleration of the object
Newton's 3rd law a force equal in magnitude and opposite in direction to that of the first body.
Created by: L0908964