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science final

Terms in this set (33)

a push or a pull in a sepecific direction
force
the combination of all the forces acting on an object
net force
what are balanced forces?
equal forces acting in opposite directions. no movement.
what are unbalanced forces?
forces that are not equal. they will cause acceleration or movement.
what is the equation for speed?
speed=distance/time
what is the equation for distance?
distance=speed x time
what is the equation for time?
time= distance/speed
what is velocity?
the speed of something in a given direction.
what is acceleration?
•speeding up
•slowing down
•changing direction
what is a pure substance consisting of one type of atom?
an element
what has 2 or more atoms of the same elements binded together?
a molecule
what has 2 or more different elements binded together ?
a compound
a change in matter that does not alter chemical composition
a physical change
a change in matter that results in a new substance
a chemical change
2 more reactants combined to form new products
chemical reaction
what is some evidence of a chemical reaction?
•what you see
•smell
•feel
•bubbles
•precipitate
•temp change
what is a period (for like the periodic table 😑) ?
the horizontal rows
what does the number next to the period tell you?
number of rings on the Bhore model
what is a family/group #?
the vertical Columns on the periodic table
what does the number above each family tell you?
number of valence electrons
which family is the least reactive?
the noble gasses
how many periods of elements are there?
7
the electrons found on the rings are called what? and what do they determine?
valence electrons. they determine reactivity
why do elements have similar properties?
because they have the same number of valence electrons and are in the same family
how likely an element is to react with other elements is called?
reactivity
what is friction?
the resistance that one surface or object encounters when moving over another
what is inertia?
a tendency to do nothing or remain unchanged.

an example is the flicking of the paper card and the coin falling into the cup
what is newtons 1st law?
an object in motion stays in motion and an object at rest stays at rest
what is newtons 2nd law?
the more force applied To an object, the more acceleration the object will have
what is newtons 3rd law?
there is an equal and opposite reaction force. whatever you are touching touches back.

example: rockets
what is the equation for force?
force=mass x acceleration
what is the equation for mass?
mass= force/acceleration
what is the equation for acceleration?
acceleration=force/mass
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