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Integrated ScienceIntegrated Science
Review Items
Dr. May
VelocityVelocity
Velocity is in meters/second
v = d/t
Distance is in meters
d = vt
Time is in seconds
t = d/v
AccelerationAcceleration
Acceleration is in meters/second2
a = v/t
Velocity is in meters/second
v = at
Time is in seconds
t = v/a
ForceForce
Force is in kg meters/sec2 or Newtons
F = ma
Acceleration is in meters/second2
a = F/m
Mass is in kilograms (kg)
m = F/a
GravityGravity
Distance is in meters
d = ½ gt2
The acceleration of gravity (g) is
9.8 meters/second2
Time is in seconds
____
t = √2d/g
MomentumMomentum
Momentum (p) is in kg meters/second
p = mv
Mass is in kilograms
m = p/v
Velocity is in meters/second
v = p/m
Electric CurrentElectric Current
Potential difference is in volts
V = IR
Current (I) is in amperes
I =V/R
Resistance is in ohms ()
R = V/I
PowerPower
Power is in watts
P = IV
Current (I) is amperes
I = P/V
Potential difference is in volts
V = P/I
Electrical EnergyElectrical Energy
Electrical energy is in kilowatt hours (kWh)
E = Pt
Power is in kilowatts
P = E/t
Time is in hours
T = E/P
Density of LiquidsDensity of Liquids
Density is in grams/milliliter
D = m/V
Volume is in milliliters (ml)
V = m/D
Mass is in grams
m = DV
Density of SolidsDensity of Solids
Density is in grams/cubic centimeter
D = m/V
Volume is in cubic centimeters (cm3)
V = m/D
Mass is in grams
m = DV
Light YearsLight Years
The speed of light is 3.0 x 108 m/s
A light year is a unit of distance
A light year is 9.5 x 1015 meters
It would take 10 million years to drive one light year at 60 mph
Light Years AwayLight Years Away
The closest star is 4.3 light years away
The next closest galaxy (Andromeda) is 2 million light years away
Giant elliptical galaxies may be 200,000 light years in diameter
Dying StarsDying Stars
Small stars become red giants
A white dwarf is the remaining dim core of a dying star
The sun will last another 5 x 109 years and will become a red giant
SupernovasSupernovas
A supernova is an exploding large star
Large supernovas form black holes
The remaining core of a supernova is a dense neutron star
The SunThe Sun
The sun is a small starLight travels from the sun to earth in 8 min.The sun’s size is 110 times that of earthThe sun’s diameter is 1.4 x 106 kilometersThe sun is 90% hydrogen and 9.9% helium
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