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1st Semester Vocab

1st semester science vocab 8th grade

TermDefinition
mass This is the amount of matter in an object.
volume This is the amount of space an object takes up or can hold.
density This is how compact an object or substance is.
triple-beam balance This is an instrument used to measure mass.
graduated cylinder This is a measuring instrument for the volume of fluids.
physical change This is a change in appearance or phase that does not change the chemical composition.
chemical change This is a change in the chemical composition of an object or substance.
proton This is a subatomic particle located in the nucleus. It has a positive charge.
neutron This is a subatomic particle located in the nucleus. It has no charge.
electron This is the smallest subatomic particle. They have a negative charge and are located in the electron rings.
balanced force This means that the net force on an object is zero, and the object is not moving.
unbalanced force This means that the net force on an object is greater than zero, and the object is moving.
Newton's 1st law This law states that an object at rest will remain at rest, and an object in motion will remain in motion with the same velocity unless acted upon by an unbalanced force.
Newton's 2nd law This law states that the mass of an object is inversely proportional to its acceleration, and the force on an object is directly proportional to its acceleration.
Newton's 3rd law This law states that for every action, there is an equal and opposite reaction.
atom These are the building block and most simple unit of matter. They cannot be broken down further.
molecule These form when two or more atoms bond together chemically.
speed This is the distance that something travels in a given amount of time.
velocity This is speed in a certain direction.
acceleration This is a change in speed or direction.
Created by: z0907338