science test- chp 1-3- freshman

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scientific method
are procedures used to gain, organize, and apply new knowledge about the world
fact
a close agreement by competen observers who make a series of observations of the same phenomenon
hypothesis
an educated guess
theory
a combination of a large amount of information, including well-tested hypotheses, about some aspect of the natural world
law
a well test theory of significant value
force
a push or pull
net force
the sum of all the forces acting on an object
vector
a quantity that has an amount, unit, and direction
scalar
a quantity that has only an amount and unit, but no direction
mechanical equilibrium
is a state where in no physical changes occurred it is a set of steadiness
equilibrium rule
whenever the net force on an object is zero, the object is said to be in mechanical equilibrium. you can express this mathematically
resultant
the sum of two or more vectors
friction
is a force acting between materials touching as they move past each other
inertia
the property of an object to resist changes in its motion
newtons first law of motion
every object continues in a state of rest, or if uniform speed in a straight line, unless acted upon by a nonzero net force
mass
is the measure of inertia
weight
is the force of gravity on an object. it depend on mass.
newton
the scientific unit of force