# Shared Flashcard Set

## Details

Physical Science Chp 2
Important Terms and Ideas of Physcial Science Chp 2
30
Science
09/17/2012

Term
 Frame of Reference
Definition
 position relative to something, starting point.
Term
 Speed
Definition
 rate at which it covers distance
Term
 Velocity
Definition
 Vector Quantity that includes both speed and direction
Term
 Acceleration
Definition
 velocity changes, decrease or increase
Term
 Scalar Quantity
Definition
 number and a unit
Term
 Vector Quantity
Definition
 has a direction as well as magnitude
Term
 Vector
Definition
 has direction and magnitude
Term
 Inertia
Definition
 The reluctancy of an object to change its state of rest or of uniform motion in a strait line
Term
 Accerleration of Gravity
Definition
 g=9.8m/s squared, if there is no air resistance. 2 seconds (9.8x2) 3 seconds(9.8x3)
Term
 Mass
Definition
 quantity of matter; the more mass the greater its inertian and the more matter it contains
Term
 Kilogram (kg)
Definition
 unit of Mass for SI
Term
 Force
Definition
 is any influence that can cause an object to be accelerated
Term
 Newton (N)
Definition
 Unit for Force in SI
Term
 Weight
Definition
 is the force with which it is attracted by the earth's gravitational pull.
Term
 First Law of Motion
Definition
 Object at rest remains at rest, moving remains moving (Strait Line)
Term
 Second Law of Motion
Definition
 Net Force is the Mass times acceleration. direction of force is the same as that of acceleration
Term
 Third Law of Motion
Definition
 When one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object
Term
 Action Force
Definition
 First object exerts this force on the second
Term
 Reaction Force
Definition
 Second object exerts this force on the First
Term
 Centtipetal Force
Definition
 inward force on an object moving in a curved path
Term
 Newton's Law of Gravity
Definition
 Objects attract other objects with force proportional to G*M1*M2/R2
Term
 Aristotle on Motion
Definition
 Heavy things sink, light things rise. Earth returns to earth, and objects must have force to move, rest is natural
Term
 Galileo on Motion
Definition
 Actually tests it, experimented, Inertia-objects resist change
Term
 Free Fall
Definition
 g=9.8 meters per second squared, only force acting on it is gravity
Term
 Projectile Motion
Definition
 parabolic pattern, angle not 90degress(not strait up) its gonna curve...
Term
 Air Resistance
Definition
 prevents falling objects from continuing to accelerate at g(9.8)
Term
 Isaac Newton
Definition
Term
 Circular Motion
Definition
 needs centripital force... constantly changing direction
Term
 Artificial Satellites (Space Junk)
Definition
 Monitor them, can't go get them... they are in orbit, and moving fast
Term
 Net Force
Definition
 needed to move something, or slow it down
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