# Shared Flashcard Set

## Details

Physics 101
exam 2
65
Physics
07/07/2013

Term
 categories of motion
Definition
 terrestrial- on earthcelestial- skies
Term
 terrestrial motion types
Definition
 natural- where the earth wants it, smoke rises, rocks fallviolent- anything that requires push or pull
Term
 natural motion
Definition
 Terrestrial.based on four elements- wind air water fireobject goes where earth wants itVertical
Term
 Violent Motion
Definition
 Terrestrial.anything that requires a push or pull that will eventually stop unless push/pull again.Horizontal
Term
 Celestial Motion
Definition
 sun and planets around earth4 elements plus etherPerfect and Circular
Term
 Galileo's Law for falling
Definition
 neglecting air resistance, if two objects are dropped together will fall together regardless of weight, shapes or materials used.(gave natural motion a fatal blow)
Term
 Newton's First Law:Law of Inertia
Definition
 if there is nothing to stop it, it will go forever rest will stay at rest motion will stay in motion when friction is at 0When there is no force acting on a moving object it keeps moving forever.
Term
 Velocity
Definition
 Speed with Direction
Term
 Speeds = d/t
Definition
 distance traveled per unit time
Term
 Average Speed
Definition
 speed needed to cover same distance same time at unchanging speedhigher average speed at constant speed.
Term
 instantaneous Speed
Definition
 speed at an exact moment in time.speedometer
Term
 scalar
Definition
 speed specified by one number30 MPHscalar- speed- specific
Term
 vector
Definition
 speed specified by number and direction30 MPH Southvector- velocity- variety
Term
 Accelerationa= change in V/T to change
Definition
 change in velocity over time. Can be speed or direction. if remains the same no acceleration
Term
 Acceleration Due to Gravity (g)
Definition
 any free falling object's acceleration is 9.8 m/s^2speed is proportional to time falling
Term
 Speed of Free falling bodyS= a*t
Definition
 The speed of a falling body is directly proportional to the time the object has been falling.if the object is falling the acceleration is acceleration due to gravity (g)speed= acceleration * time
Term
 Distance of Free Falling BodyD= 1/2 * a * t^2
Definition
 the distance of a free falling object is directly proportional to the square of the time the object has been fallingfor all cases of constant acceleration, if the object is falling, it is the acceleration due to g (9.8m/s^2)distance= 1/2 acceleration * Time^2
Term
 Newton's Second LawFnet = m*a
Definition
 Acceleration is proportional to net force, but inversly proportional to the mass.acceleration = Fnet/mFnet = mass * accelerationharder to move, more inertia, more mass
Term
 Fnet
Definition
 f net = f1-f2 if forces are oppisitef net = f1+f2 if forces are the same
Term
 categories of motion
Definition
 terrestrial- on earthcelestial- skies
Term
 terrestrial motion types
Definition
 natural- where the earth wants it, smoke rises, rocks fallviolent- anything that requires push or pull
Term
 natural motion
Definition
 Terrestrial.based on four elements- wind air water fireobject goes where earth wants itVertical
Term
 Violent Motion
Definition
 Terrestrial.anything that requires a push or pull that will eventually stop unless push/pull again.Horizontal
Term
 Celestial Motion
Definition
 sun and planets around earth4 elements plus etherPerfect and Circular
Term
 Galileo's Law for falling
Definition
 neglecting air resistance, if two objects are dropped together will fall together regardless of weight, shapes or materials used.(gave natural motion a fatal blow)
Term
 Newton's First Law:Law of Inertia
Definition
 if there is nothing to stop it, it will go forever rest will stay at rest motion will stay in motion when friction is at 0When there is no force acting on a moving object it keeps moving forever.
Term
 Velocity
Definition
 Speed with Direction
Term
 Speeds = d/t
Definition
 distance traveled per unit time
Term
 Average Speed
Definition
 speed needed to cover same distance same time at unchanging speedhigher average speed at constant speed.
Term
 instantaneous Speed
Definition
 speed at an exact moment in time.speedometer
Term
 scalar
Definition
 speed specified by one number30 MPHscalar- speed- specific
Term
 vector
Definition
 speed specified by number and direction30 MPH Southvector- velocity- variety
Term
 Accelerationa= change in V/T to change
Definition
 change in velocity over time. Can be speed or direction. if remains the same no acceleration
Term
 Acceleration Due to Gravity (g)
Definition
 any free falling object's acceleration is 9.8 m/s^2speed is proportional to time falling
Term
 Speed of Free falling bodyS= a*t
Definition
 The speed of a falling body is directly proportional to the time the object has been falling.if the object is falling the acceleration is acceleration due to gravity (g)speed= acceleration * time
Term
 Distance of Free Falling BodyD= 1/2 * a * t^2
Definition
 the distance of a free falling object is directly proportional to the square of the time the object has been fallingfor all cases of constant acceleration, if the object is falling, it is the acceleration due to g (9.8m/s^2)distance= 1/2 acceleration * Time^2
Term
 Newton's Second LawFnet = m*a
Definition
 Acceleration is proportional to net force, but inversly proportional to the mass.acceleration = Fnet/mFnet = mass * accelerationharder to move, more inertia, more mass
Term
 Fnet
Definition
 f net = f1-f2 if forces are oppisitef net = f1+f2 if forces are the samedetermines accelerationwhen objects not accelerating, Fnet must equal 0
Term
 WeightW= m*g
Definition
 on the surface of earth, force exerted by gravitational pull of earth on an objectTension = WeightWeight= mass * gravity (9.8)
Term
 Normal force
Definition
 upward push. equal to its weight (downward push)
Term
 Tension t=mg
Definition
 tension = weight w= mg so t= mg
Term
 Newton's 3rd LawThe Law of Force Pairs
Definition
 when you push an object the object pushes back at you.
Term
 SpringsF= kx
Definition
 k= spring constantsmaller the constant more it stretchesx= distance compressed or stretched
Term
 Momentum (p)p= m* v
Definition
 the momentum of an object of mass (m) moving with velocity (v) Vector- speed w direction
Term
 Conversion of momentum (p)
Definition
 if there are no external forces, the total momentum is conserved (unchanged), regardless of parts acting upon each other
Term
 Gravitational forces
Definition
 force due to gravity = weight (m*g)Newton said- same force that holds moon in orbit that pulls apple from tree to ground.
Term
 Law of GravitationF gravity= g * m1*m2/r^2
Definition
 if mass doubles, G force doubles.if g force divided by 4 the separation of masses doublestwo forces get farther from each other G Force gets smallerresponsible for life cycle of stars
Term
 life cycle of stars
Definition
 depends on mass. formed by gravitational attraction of and collapse of hydrogen clouds
Term
 hydrostatic equilibrium
Definition
 in the sun competition between gravitational pull and tendency of very hot matter to expand
Term
 Death of the sun
Definition
 follows the exhaustion of all its fuelouter layers blow away only core left, (planetary nebula) continues to contract until size of earth-- ends white dwarf
Term
 planetary nebula
Definition
 red and purple areas visible in light blue in x ray light
Term
 supernova
Definition
 stars larger then 10 masses of the sun go through multiple collapses and cycles fusing helium carbon - iron causes star to implode and explode10% remains
Term
 neutron star
Definition
 mass of 10- 30 suns gravitational force strong enough that atoms and nuclei don't exist. electrons collapse into protons and form neutronssolidly packed ball of neutrons
Term
 Black Hole
Definition
 30 times mass of sun star collapses to single point
Term
 workw= F* d
Definition
 when a force (F) acts on an object that moves it a distance (d) in the direction of force (F)work = Force * distance
Term
 energy
Definition
 the capacity to do work. a system has energy whenever it has the capacity to do workGravitational Potential Energy (Egrav)
Term
 Gravitational Potential EnergyE grav = m*g*h
Definition
 the product of weight times the height above the groundPotential energy = weight (m*g) * height
Term
 work-energy theorem
Definition
 Work is a transfer energy from one system to another
Term
 Kinetic EnergyE kin = 1/2 mv^2
Definition
 the energy of motion related to its velocity and its mass.e Kin = 1/2 mass* velocity^2
Term
 Elastic Potential EnergyE spring = 1/2 k*x^2
Definition
 x= distance spring is stretched/ compressedk= spring constant
Term
 conservation of energy
Definition
 energy is always conserved, although it may change it's formno execptions
Term
 types of energy
Definition
 electrical, chemical, nuclear, radient, mass energy
Term
 Total Energy
Definition
 sum of Kinetic and Potential
Term
 PowerP= w/t
Definition
 work done divided by time to do itpower= work/ timeWatts
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