Integrated Science Review Items Dr. May

Velocity Velocity is in meters/second v = d/t Distance is in meters d = vt Time is in seconds t = d/v

Acceleration Acceleration is in meters/second 2 a =  v/t Velocity is in meters/second  v = at Time is in seconds t =  v/a

Force Force is in kg meters/sec 2 or Newtons F = ma Acceleration is in meters/second 2 a = F/m Mass is in kilograms (kg) m = F/a

Gravity Distance is in meters d = ½ gt 2 The acceleration of gravity (g) is 9.8 meters/second 2 Time is in seconds ____ t = √2d/g

Momentum 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 Current Potential difference is in volts V = IR Current (I) is in amperes I =V/R Resistance is in ohms (  ) R = V/I

Power Power is in watts P = IV Current (I) is amperes I = P/V Potential difference is in volts V = P/I

Electrical 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 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 Solids Density is in grams/cubic centimeter D = m/V Volume is in cubic centimeters (cm 3 ) V = m/D Mass is in grams m = DV

Light Years The speed of light is 3.0 x 10 8 m/s A light year is a unit of distance A light year is 9.5 x meters It would take 10 million years to drive one light year at 60 mph

Light 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 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 10 9 years and will become a red giant

Supernovas A supernova is an exploding large star Large supernovas form black holes The remaining core of a supernova is a dense neutron star

The Sun The sun is a small star Light travels from the sun to earth in 8 min. The sun’s size is 110 times that of earth The sun’s diameter is 1.4 x 10 6 kilometers The sun is 90% hydrogen and 9.9% helium