# Shared Flashcard Set

## Details

mr. leveques physics midterm
FML
43
Physics
01/17/2010

Term
 what does g equal?
Definition
 9.81 m/s2
Term
 what is the SI unit for length?
Definition
 the meter
Term
 what is the SI unit for time?
Definition
 second
Term
 what is the SI unit for mass?
Definition
 the kilogram
Term
 what is distance?
Definition
 the length of a path travelled between start and stopping points (Scalar)
Term
 what is displacement?
Definition
 change in postion. total distance travelled.   (Vector)
Term
 what does Vi stand for?
Definition
 inital velocity
Term
 what is a scalar?
Definition
 just a number   e.g. boston is 50 miles away   Must be +
Term
 what is a  vector?
Definition
 number and direction   e.g. boston is 50 miles away north. can be +or-
Term
 what is the equation for a?
Definition
 a=5v/5t
Term
 what is the equation for velocity?
Definition
 v=5x/5t vector
Term
 all objects fall towards earth with the _____?____ acceleration
Definition
 same
Term
 what is free fall?
Definition
 when something is falling towards the earth due to ONLY gravity
Term
 how do you graphically add vectors?
Definition
 draw out arrows and place them "Tip to Tail"
Term
 what is a reference frame?
Definition
 a coordinate ststem used to specify the percise location in space (where do you measure the motion from?)
Term
 What do these variables mean? VAB
Definition
 V-Velocity A- object thats moving B-where you are measuring from
Term
 A_____?_____ requires a push or pull
Definition
 Force
Term
 what is the unit of force?
Definition
 The newton
Term
 what does 1 newton equall?
Definition
 1 kg m/s2
Term
 what is the weakest force?
Definition
 gravity
Term
 what is the net force?
Definition
 the combo of all forces acting on an object.   this should equall zero when an object is still
Term
 W=?
Definition
 mass*g
Term
 forces cause ___?___
Definition
 acceleration
Term
 why does mass resist acceleration
Definition
 because of inertia
Term
 every action has an ___?___and ____?____ reaction
Definition
 equal, opposite
Term
 this always opposes the movement
Definition
 friction
Term
 this type of friction is exerted on a motionless body
Definition
 static friction
Term
 this type of friction is only on objects in motion
Definition
 kinetic friction
Term
 why does friction happen?
Definition
 because of tiny microscopic irregularities that all surfaces contain
Term
 the ____?____ friction is always more than the ____?____ friction
Definition
 static, kinetic
Term
 what is work?
Definition
 the product of force and the displacement in the direction of that force
Term
 Work=?
Definition
 force x displacement x            (cos theta)
Term
 what is power?
Definition
 the rate at which work is done.   5ke/5t
Term
 p=?
Definition
 w/t or f x v
Term
 what is energy?
Definition
 the ability of an object to cause a change in its self or its enviroment
Term
 what is momentum?
Definition
 the product of objects mass + velocity
Term
 what is an inelastic collision?
Definition
 you lose kinetic energy
Term
 what is an elastic collision?
Definition
 momentum and kinetic energy are reserved.
Term
 what is G?
Definition
 the gravitational constant 6.67x10-11
Term
 the planets move around the sun in an ____?____ shape
Definition
 eliptical
Term
 what is a planets period?
Definition
 the time it takes to make 1 revolution. (One trip around the sun)
Term
 what is the equation for tangental speed?
Definition
 V=rw
Term
 what is the equation for centripetal acceleration?
Definition
 Ac= w2r
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