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30 Cards in this Set
- Front
- Back
name the four fundamental forces
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weak force, strong force, gravitational force, and electromagnetic force
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what 2 forces are really diff aspects of the same force
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electromagnetic and weak force
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weakest of fundamental forces
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gravitational
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strongest fundamental force
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strong force :)
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three principles of newton's universal law of gravitation (just give it a shot)
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1. all objects with mass are attracted to one another by the gravational force
2. the gravational force between 2 masses is directly porportional to the mass of each object 3. the gravitational force between two masses is inversely porportional to the square of the distance between those two objects. |
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three principles of newton's universal law of gravitation: (give me the gist)
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1. all objects are attracted to eachother
2. gravitational force is directly porportional to mass of each 3. you're going to invert and square distance between them to figure amount of force (all attracted, mass of each matters, invert and square distance for force) |
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force between 2 objects (1st 10kg, 2nd 6kg) measured at distance of 10 cm.
if 10 replaced with a 20kg, and 6 with a 12kg, how does new force compare? |
(2 x 2) The new gravitational force is 4 times stronger.
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force between 2 objects (1st 10kg, 2nd 6kg) measured when 10 cm apart.
if distance increased to 40cm, how does new force compare? |
1/4 squared. it decreases by a factor of 16.
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force between 2 objects (first 1 kg, second 2kg) measured at distance of 12cm.
1kg mass replaced with 5kg, 2kg replaced with 4kg, AND distance reduced to 4cm... how does new force compare? |
(5 x 2 x 3squared)
90 times stronger |
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if planet orbits sun because sun exerts gravity on it, what is equal and opposite force required by Newton's third law?
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planet exerts gravitational force on the sun.
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what kind of force necessary for circular motion
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centripetal force
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definition of centripetal force (include its direction)
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the force necessary to make an object move in a circle. it is directed perpendicular to the velocity of the object, which means it points toward the center of the circle 00000
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in hammer throw, guy twirls ball faster and faster... will wire have to apply more, less, or same amount of centripetal force?
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more
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three principles of centripetal motion (c'mon, you've got this)
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1) circular motion require centripetal force
2) the larger the cent. force, the faster an object travels in a circle of a given size 3) at a given speed, the larger the centripetal force, the smaller the circle |
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lets say a ball sweeps out in a circle in the hammer throw but starts to make the circle bigger. will the wire have to exert more, less, or same amount of centripetal force
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less
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what is centrifugal force
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a fictional force
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if a ball travels in a circle, tell me where the centripetal force would point to
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it would point the center of the circle,perpendicular to the ball's velocity at a given second
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inner planets
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mercury, venus, earth, mars
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outer planets
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jupiter, saturn, uranus, neptune
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list solar system planets in order of closest to sun
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mercury, venus, earth, mars, jupiter, saturn, uranus, neptune
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list the planets with rings
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jupiter, saturn, uranus, neptune
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where are most of solar system's asteroids?
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BETWEEN MARS AND JUPITER
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what causes an asteroid to become a meteor?
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peturbations in its orbit cause it to be thrown off course into another planet's atmosphere
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three parts of a comet
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coma, tail, nucleus
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what part of a comet is always present
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nucleus
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during what part of a comet's orbit are all three of its parts present
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when its close to the sun
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comets orbits: circular or elliptical?
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elliptical
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where do most physicists think short-period comets come from?
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the KUIPER BELT
(oort cloud is a theory of where long-period ones come from ) |
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what causes gravity according to Einstein's theory of relativity
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space and time bending from the presence of a massive object
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what causes gravity according to the graviton theory
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massive objects moving closer to eachother so they can exchange gravitons in a short time interval
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