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33 Cards in this Set
- Front
- Back
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Planets
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all objects revolving around a star
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Satellites
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objects revolving around planet. Moon is natural satellite of earth. Pluto is NOT considered a planet.
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245 earth years
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= 1 Pluto Year
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the bigger the mass
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the bigger the gravitational pull
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Solar Eclipse
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moon comes between sun and earth
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Lunar Eclipse
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when earth comes between sun and moon
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Keplars 1st Law
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All planets revolve around sun in an elliptical orbit with sun at one center of the ellipse
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Keplars 2nd Law
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All planets cover same area in same time
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Keplars 3rd Law
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Period^2/Radius^3 = Constant
Earth year = Ey = period astronomical unit = au = Radius |
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The Four Forces
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Gravitational
Electrical Weak Nuclear Strong Nuclear |
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Newtons Law of Gravitation
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Any two objects attract each other with force of attraction directly proportional to the product of air masses inversely proportional to the square of distance between them
F = G x mass 1 x mass2/distance^2 or F = Gm1m2/d^2 G = Gravitational constant G = 6.67 x 10^-11 |
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Escape Velocity
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launching space ship against rotation of earth and close to equator so no bounce effect occurs
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Escape Velocity
equation |
V esc = Square root of 2GM/R
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Latent heat or hidden heat
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change of phase
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Convection
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solids: internal energy by molecular and electronic collisions within substance
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Conduction
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Liquids and Gases: transfer by currents in heated fluid; fluid flows carrying it
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Radiation
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Solid, Liquid, Gas: transfer by electromagnetic waves
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Electricity
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electrons conduct electricity
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static
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charges do not move
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kinetic
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charges are moving
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Charges
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positive and negative
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Law of Charges
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like charges repel, unlike charges attract
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Law of Conservation of Charges
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charges can neither be created nor destroyed
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Ohm's Law
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Voltage is directly proportional to the current.
Higher voltage, higher current V = I x R V/I = R = Resistance |
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Series connection
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Rs = R1 + R2 + R3
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Parallel Connection
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1/Rp = 1/R1 + 1/R2 + 1/R3
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Archimedes principle
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an immersed body is buoyed up by a force equal to the weight of the fluid it displaces
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Principle of Flotation
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A floating object displaces a weight of fluid equal to its own weight
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Boyle's Law
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The product of pressure and volume is a constant for a given mass of confined gas regardless of changes in either pressure or volume individually, so long as temperature remains unchanged
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Bernoulli's principle
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The pressure in a fluid moving steadily without friction or outside energy input decreases when the fluid velocity increases
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Pascals Principle
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a change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid
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Barometer
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an device used to measure atmospheric pressure
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Pressure
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the ratio of force to the area over which that force is distributed
Pressure = force/area Liquid Pressure = weight density/depth |
