# Science Test Exam

## Terms

undefined, object
copy deck
mass
the amount of material in an object
scientific law
a theory that was tested many times and the results were always the same
balanced forces
when there is no movement, there are:
unbalanced forces
when there is movement there are: (when you step into quicksand)
gravity
a force that every object in the universe exerts on every other object (a force that pulls a skateboarder down a slope)
friction
the force that opposes motion
average speed
refers to the distance and time of an entire trip
reaction
a force that is opposite to an action
inertia
resistance to a change in motion
km/h
kilometers per. hour
force
any push or pull on an object
kilograms
a unit of measure used to measure mass
m/s/s
meters per. second meters per. second
weight
the measure of how much Earth's gravity pulls down on an object
Newton's 3rd Law
For every action there is an equal and opposite reaction. (When a bird flies upward.)
Newton's 2nd Law
Acceleration of an object increases as the amount of force causing acceleration increases. The larger the mass of the item, the larger the force needed to result in acceleration. (When a golfer needs to hit a long distance, he uses a driver rather than an iron)
Newton's 1st Law
An object in motion will remain in motion, and an object at rest will stay at rest unless a force acts on it. (Why we should wear seat belts.)
m/s
meters per. second
Newton
a unit of measure used to measure weight
acceleration
this means that something is speeding up
a scale
a device used to measure weight
a=f/m or F=m x a
mathematical formula that describes Newton's second law. (Acceleration = Force/Mass) and (Force= Mass x Acceleration)
a balance
a device used to measure mass
friction
this force slows down all moving objects

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