Why does Archimedes' Principal relate to buyonat force, why not just describe it with Newton's Law (Equal and
400397
I guess the only opposite reaction Archimedes got was from the townsfolk when he did his infamous streak.\nAll Archimedes described was displacement for a given volume.If it weighs less than the same volume of water it'll float.( Same applies to Zeppelins in air)\n\nAn equal opposite reaction can be observed when you drop a life raft from a helicopter. It'll bounce up out of the water, when that energys spent it'll settle back down niceley conforming to Archimedes.
260486
im pretty sure itz derived from newtons laws. his F=ma.
1155012
Newton's "law" of gravity is a mathematical description of the way bodies are observed to attract one another, based on many scientific experiments and observations. The gravitational equation says that the force of gravity is proportional to the product of the two masses (m1 and m2), and inversely proportional to the square of the distance (r) between their centers of mass. Mathematically speaking, \n\nF=Gm1m2 / r2, \n\nwhere G is called the Gravitational Constant. It has a value of 6.6726 x 10-11 m3 kg-1 s-2.
278823
Lets not confused inertia with Newton first law of motion.\nFirst of all Einstein showed that what is called Inertia is really the field curvature of Space.The first law has been translated and interpreted different ways.\nIt could be stated this way.A mass moves because Power has been invested to make it move.The mass continues to move with a set amount  amount of energy unless  interaction of another mass changes the energy of the motion.\n\nThe word Newton used for power was not force. He used the word impetus.Pehaps Newton has been Misunderstood.\n\n Inertia means gravity Power that is stored in \nspace.\n\nTo make an object move you must Use Power to  counter act the Gravity power that is holding it down.
1006189
Explain Newtons laws of motion.
27041
Newtons law is called the Laws of Motions. There are three laws for it. The first law is known as the  "law of inertia" states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Basically if objects are not at equilibrium they do not accelerate, they only accelerate if there is a net or unbalanced force acting upon it. The second law is mainly about the behavior of objects. That all existing forces are not balance. It states thatacceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The third law is known as " for every action there is an equal and opposite reaction " this basically states that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
1053598
http://en.wikipedia.org/wiki/Gravitation#Newton.27s_law_of_universal_gravitation
819927
All objects react as if there were only a single force acting upon them. Let's say an object on your desk had a force of ten newtons pushing it to the east. Let's call that force positive 10 newtons. According to Newton's second law, it would accelerate (pick up speed) moving in an eastward direction. It had a single force acting upon it and since there was no opposing force we say that it was an unbalanced force. Now say the same object had another force of 10 newtons acting on it in a westward direction. Lets call that force negative 10 newtons. Now we have two forces and since they are equal but have opposite signs the algebraic sum is zero ([+10N] + [-10N] = 0). We now have balanced forces - equal but opposite. Remember I said that all objects react as if there were only one force acting upon them? Even though there are two forces acting in opposite directions on the object on your desk, that object reacts as if there were only one force acting upon it - a force of zero newtons. BTW, that sum force is called the resultant. So according to Newton's first law since a zero force is applied to the object it will remain at rest. In short, unbalanced forces result in movement, balanced forces don't.
63147
Archimedes' principle states that the buoyant force experienced by a submerged object is equal to the weight of the liquid displaced by the object. Experimentally this appears in the fact that the submerged object apparently weighs less by an amount equal to the weight of the liquid displaced. The buoyant force can be expressed as:\n\nFb = W(air) - W(liquid) = dgv \n\nwhere d is the density of the liquid, g is the acceleration of gravity and v is the volume of the immersed object (or the immersed part of the body if it floats).
997152
You mean Newton's 2nd law of motion, don’t you?\n\nForce = mass * acceleration\n\nI like this law, a lot, actually.\nIt may not seem very intuitive at first to someone trying to learn it, but with practice, you'll come to understand.\n\nThe basic concept is that a [net] force applied to an object causes it to accelerate.  When you push on something, it moves.  They key work being a "net" force.  If there is no net force (i.e. F = 0), there is no acceleration.\nThe force the chair is exerting on you, called the "Normal" force is necessary because while you are sitting in the chair are you falling towards the ground?  No, of course not.\n\nWe all know that Earth (gravity) exerts a force on you in the downward direction, called "Weight".  Without a balancing force, you would continue to accelerate downward.  If the chair did not exert a normal force back upward to cancel weight, there would be a net force acting upon you in the downward direction which would cause you to accelerate downward.\n\nA similar case is true for other objects, like when you push on a wall.  In this case, it is not gravity which exerts the force, you are doing it.  In order to keep the wall from accelerating when you push on it, the wall must exert a force back which is "normal" to its surface.  Eventually, however, the wall will not be able to provide ample normal force to counter your push and parts of the wall will begin to accelerate as the wall breaks.
909451
The energy per unit volume of a gravitational mass is the pressure holding the mass together. so if you multipy the gravitational pressure that hold the mass together by the area enveloping the gravitational mass you obtain the total force surounding the mass.\nAs Sherlock Holmes would say = "elementary...\nTherefore from this analysis we see that The gravitational force is proportional to the curvature of the gravitational mass which in turns causes a curvature of the space gravity field.\nAnd that is the whole principle of gravity.\nIt took me years to figure that one out.
668137
According to Archimedes Principle, the upthrust force on a body totally or partially immersed in a fluid is equal to the weight of the fluid displaced by the body. \n\nImagine a ship that has a weight of 2,000,000 N.  A large crane is lowering it into the water.  When a part of the keel is submerged, it displaces, say 500,000 N of water.  There is still a net downwards force of 1,500,000 N.  If lowered further, more water is displaced, and therefore the upward force increases, while the net downward force decreases.  There comes a time when the ship, as it continues to be lowered, has displaced 2,000,000 N of water.  What then?  The upward force just balances the weight of the ship, and it sinks on further into the water.\n\nIncidentally, a needle does not always sink in water.  Smear it with oil and gently lower it in a bowl of water.  It floats!!!  Of course, this has nothing to do with Archimedes Principle but rather with the surface tension of the water molecules.
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Newton: universal absolute time, 3 dimensional Cartesian geometry, action at a distance (force), universal gravitation as a force with an inverse-square law\n\nEinstein: relative time, non-Cartesian geometry, absolute limit to speed (speed of light), 4 dimensional space-time, gravitation as a result of the curvature of space and time.
1135720
A force is a push or pull on an object.\n\nNewton's second law states that a an applied force causes an object to accelerate.  It's one of the most if not the most powerful physics equations.  Force equals mass times acceleration.  F=ma.  So when an object falls the force of an object is equal to the mass of the object times the acceleration due to Earth's gravity (9.81 m/s/s or 9.81 meters per second per second or meters per second squared.)  All objects experience the same acceleration due to gravity.  The units for force are, oddly enough, called Newtons and one newton equals one kilogram times one meter per second squared.  One pound is 4.48 newtons. \n\nNow it's important to understand that newton's second law, F=ma, applies to net forces or unbalanced forces.  Just because an object is moving doesn't mean it's accelerating.  When you press the accelerator you car speeds up and the engine is exerting a net force on the car.  When your speed maxes out at 120 or however fast your car can go the force of the engine is ballanced against the forces against the car (friction from air, the road and the engine parts)  \n\nTake tug of war.  An set of even matched teams won't result in one team moving across the line.  The forces are balanced.  Add one more strong guy to one team and the weaker team will speed up from zero to slowly moving across the line.  \n\nAlso force is cumulative.  When you can't pick up a heavy box what do you do?  You get help.  One smurf can lift a pebble but the whole smurf village can lift a boulder.\n\nAlso acceration is velocity divided by time a velocity is different from speed in that velocity is a vector, it has magnitude (speed) and direction.  If you change directions you will accelerate.\n\nIf you're in a train with no windows and an increadibly smooth track you shouldn't be able to tell that you are moving if the train't velocity is constant, however if it speeds up, slows down or goes around a corner while going at a constant speed the velocity is changing.  In the first two cases because of a change in magnitude (speed) in the last case because of a change in direction and you experience a force that pushes or pulls you in a direction.\n\nWeight is the force due to gravity and can change due to the masses of the objects involved.  For example you may have a weight of 100 lbs on earth and a mass of 40 some kilograms but on the moon you weigh 1/6 as much but still have a mass of 40 kg.  On Earth you can convert between pounds (a measure of force) and kilograms (a measure of mass) because the acceleration due to Earth's gravity (9.81 meters per second squared) is the same and cancels out in the equation.
271178
yeap. We came out with all this ¨fictional¨forces so we can be able to use Newton's law in non-inertial frames of reference ( most of the references we have ) , so when one frame of reference is accelerating ( like in a circular movement cause velocity is changing direction ) F=ma won't work unless you add this ¨force¨ , wich is not real ( cause there is no a physical thing applying the force like gravity ), so we came up with: ¨centrifugal force¨, ¨coriolis force¨ and many others that I've forgotten :P .\nthat's why we have relativity, wich newton's laws for explaining gravity..we don't use it frecuently cause we don't need to ( normal people doesn't use big numbers ), but it gives a better explanation of things.
372889
Every body that is in a fluid, or it is floating on the surface, or is sunk to the bottom loses an equal ammount of weight as the weight of the displaced fluid by the volume of the body.\n\nThe force that makes body's float or makes them lighter in a fluid (for ex. water) is called Archimed's force or Archimed's principle.\nIf this force is grater then the weight of the body (G=m*g) then the body floats on the surface.\n\nArchimed's force is greater if the density of the fluid is bigger. Oil has the density of 900 g/cm3 and water has the density of 1000 g/cm3. Because the reason why the objects are floating in oil and in water is of same nature, floating on oil is similar to floating on water.\nBut water has a bigger push force then oil.
57335
is due to the movement of a body , when a body is acelerating because it's spinning or something , it causes a drag force that affects the objects on that body ; it's not a ¨real force¨ (like gravity or a spring for example)cause is due to an acceleration; and because Newton's laws are applied only in inertial frames , people came out with this ¨ficticious forces¨( like this one and the centrifugal force for example) so we can be able to apply F=ma also in non inertial frames