# Science Test Exam

## Terms

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- 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