# Shared Flashcard Set

## Details

Physical Science Midterm
Vocabulary and definitions.
46
Physics
10/15/2012

Term
 Acceleration
Definition
 rate at which an object's speed changes
Term
 Acceleration of Gravity
Definition
 downward acceleration of a freely falling object near the Earth's surface. Described as 9.8 m/s^2
Term
 Action Force
Definition
 the first force that puts force against the reaction force
Term
 Centripetal Force
Definition
 the force on an oject moving in a curved path that is the inward force needed to cause this motion.
Term
 Constellations
Definition
 easily recognized groups of stars.
Term
 Copernican System
Definition
 model of the universe that stated all planets, including Earth, rotated around the sun. The moons rotated around their given planets.
Term
 Ellipse
Definition
 oval shaped pattern, pattern followed by Earth around the sun
Term
 Focuses
Definition
 points in an ellipse sorresponding to the positions of the tacks
Term
 Force
Definition
 any influence that can cause an object to be accelerated
Term
 Frame of Reference
Definition
 what is changing when we say something is moving, meaning its position relative to something else
Term
 Fundamental Force
Definition
 explains gravity in a sense that it cannot be explained in terms of any other force. 1 of 4 fundamental forces.
Term
 Hypothesis
Definition
 A scientific interpretation. Educated guess.
Term
 Inertia
Definition
 resistance the object offers to any change in its state of rest or motion
Term
 Joule
Definition
 Standard SI unit for energy
Term
 Kepler's First Law
Definition
 the paths of the planets around the sun are ellipses with the sun at one focus.
Term
 Kepler's Second Law
Definition
 A planet moves so that its radius vector sweeps out equal areas in equal times
Term
 Kepler's Third Law
Definition
 ratio between the square of the time needed by a planet to make a revolution around the sun and the cube of its average distance from the sun is the same for all the planets.
Term
 Kilogram
Definition
 Standard SI unit for mass
Term
 Law
Definition
 General rule of science. Tells us what
Term
 Law of Gravity
Definition
 describes the attraction all bodies in the universe have for one another
Term
 Mass
Definition
 the property of matter that shows itself as inertia
Term
 Meter
Definition
 Standard SI unit for length
Term
 Model
Definition
 simplified version of reality
Term
 Neap Tides
Definition
 the line between the Earth and the moon is perpendicular to that between the sun and Earth, the tide-raising forces partly cancel, causing these.
Term
 Newton
Definition
 Standard SI unit for force
Term
 Newton's Law of Gravity
Definition
 states that every object in the universe attracts every other object with a force directly proportional to their mass and inversely proportional to the square of the distance separating them
Term
 Newton's First Law of Motion
Definition
 states that if no net force acts on an obect, that every object continues in it's state of uniform motion in a straight line or rest
Term
 Newton's Second Law of Motion
Definition
 states that when a net force acts on an object of mass, the object is given an acceleration in the same direction of the force. F=MA, A=F/M, M=F/A
Term
 Newton's Third Law of Motion
Definition
 states that when one object exerts a force on a second obect, the second object exerts an equal but opposite force on the first object.
Term
 Planets
Definition
 large heavenly bodies that make up the solar system. Named after Roman gods.
Term
 Ptolemaic System
Definition
 model of the universe that stated the Earth as the center of the universe
Term
 Reaction Force
Definition
 The second force that puts an equal, but opposite force against the Action Force
Term
 SI
Definition
 International System of Measurement used most widely around the world.
Term
 Scalar Quantity
Definition
 measurement that has magnitude only. Mass and speed are examples.
Term
 Scientific Method
Definition
 a general scheme for gaining reliable information about the universe.
Term
 Second
Definition
 Standard SI unit for time
Term
 Significant Figures
Definition
 the amount of digits left to describe precision
Term
 Speed
Definition
 rate at which an object covers distance relative to a frame of reference
Term
 Spring Tides
Definition
 Twice a month; when the sun, moon, and Earth are in a straight line, Solar tides add to Lunar tides to create especially high and low tides
Term
 Theory
Definition
 ambitious attempt to acount for what has been found in terms of how nature works. Tells us why
Term
 Tides
Definition
 periodic rise and fall of sea levels due to changes in gravitational pull of the moon and sun
Term
 Units
Definition
 Standard quantities used in various measurement systems.
Term
 Vector Quantity
Definition
 has both magnitude and direction. Force and velocity are examples.
Term
 Velocity
Definition
 specifies both the object's speed and the direction it is moving
Term
 Watt
Definition
 Standard SI unit for power
Term
 Weight
Definition
 gravitational force in which the Earth attracts an object
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