## Second Semester Review Packet

##### Created by:

12mrichter  on June 1, 2009

##### Description:

physics study guide

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# Second Semester Review Packet

 Scientific Methodan orderly method for gaining organizing and appling new knowledge
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#### Definitions

Scientific Method an orderly method for gaining organizing and appling new knowledge
Fact close agument by coment observers who make a series of observation of the same phenomenon
Hypothesis an educated guess
Law/Principle when hypothesis about the relationships among natural quantities and tested over and over again
Therory a synthisis of a large body of info that compasses WELL TESTED AND VARIFID HYPOTHESIS
Independent Variable the variable that you change on purpose
dependent variable variable that remains constant
qualitative obsevations obsevations on color of shape
quantitative obsevations obsevations with numbers
force push or pull
net force the combination of all forces acting on an object
vector an arrow that represents the magnitude and direction
Vector quantity the quantity that need both magnitude and direction
scalor quantity the quantity that can be described ny magnitude only, NO DIRECTION
mechanical equilibrium the state where there is no physical change
support force the upward force that ballences the object
reaultant the sum of two or more vectors
friction force that acts beetween materials that touch as they move past each other
inertia the property of a body to resist change to it's state of motion
Newton's first law law of inertia
Law of Inertia an object in motion tends to stay in motion and an obect at rest tends to stay at rest unless acted on by an outside force
Kilogram the SI unit of mass
mass amount of matter in an object
wieght the force of gravity on a object
Newton Unit of force
Relative one objectin respect for the other
Speed how fast an object is moving
Instantaneous speed The speed at any instant
Average Speed total distance coverd divided by the time it took
velocity speed in any given direction
Acceleration the rate at which velocity is changing
Free fall an object moving under the inflence of gravity only
Elapsed time the time that has past
Horizontal Component a force moving paralle to the ground
vertical component vertical motion (free fall)
Resultant the sum of two or more vectors
projectille any object that moves through the air acted in only be gravity
Inversly proportional two values changing in opopisite directions
newtons second law f=ma
Fluid Gas or Liquid
Air Resistance friction action on something moving through the air
free body diagram a diagram showing all the forces acting on an object
pressure the amount of force per unit of area
pascal what pressure is measured in
terminal speed the speed at which the acceleration of a falling object
terminal velocity terminal speed together with the direction the direction of motion
Interaction a action between one thing and another
newton's third law every action has an ewual and opisite reaction
action force one forece equal and oppisite to the reaction force
reaction force the other force equal and oppisite to the action

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