science Tell me two types of force?
154823
Strickly speaking there are four fundamental forces: electromagnetic, gravity, the strong nuclear, and the weak nuclear force.\n\nOn the other hand, it has been shown that the electromagnetic and weak forces are two aspects of the same thing - sort of like how ice and water are two aspects of the same thing. And it has been shown that this electroweak force is the same as the strong nuclear force.\n\nIn other words, those three forces are really one force that we observe as different aspects.\n\nGravity has yet to be connected. String theories are one way being pursued to try and link all four forces together. I ten to think, and most physics people do, that gravity is related. \n\nBut if it isn't then we have : electroweak-strong and gravity as the two forces.
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.
53644
The same 4 fundamental forces in the universe: Strong, weak, electromagnetic and gravity. Of course, it should be noted that we have made substantial progress into showing that the weak and electromagnetic forces are two aspects of the same force, and that even the strong force can be associated very closely with the electroweak force. There are many attempts to connect all 4 forces into one universal force law, but this effort is not yet complete and the results are not yet universally accepted. \n\nThere are some indications that we do not really understand gravity very well, because we do not understand its quantum aspects too well, and there is even evidence emergy for some sort of repulsive gravitational phenomenon from astronomical observations. \n\nThe discovery of any other forces would be quite surprising, and very big news.
225230
there are only 2\n\n1 is that you have to apply a force, and 2 is that something has to happen ie. movement
64586
Physical Science or Physics
280074
The four forces of nature, in order of their strength: \n1. Strong Nuclear Force\n2. Electromagnetic Force\n3. Weak Nuclear Force\n4. Gravity.\n\nThe four forces, in order of the distance over which their influence is felt:\n1. Gravity\n2. Electromagnetic Force\n3. Weak Nuclear Force\n4. Strong Nuclear Force
1164784
Add up one opposite vector (going up). In physics, they call it NORMAL FORCE.
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E=MC squared. \nE is energy.\nM is mass(weight).\nC is the speed of light.\n\nForce, on the other hand, is mass times speed.
903133
From what I learned in physics class, the force you are speaking of is measured in Newtons.
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depends on the direction of the force
794968
.  Gravity and magnetism are two very different kinds of forces.  Gravity is always attractive and is proportional to the masses of two objects and how close together they are.  Magnetism can be attractive (pulling objects together) or repulsive (pushing them apart).  Magnetism is due to electric fields, either in the atoms of certain materials or electric fields resulting from electric currents in a sizable quantity of material.\n.  The earth might be a large magnet, with a net magnetic orientation in its solid iron inner core making the core a magnet, but its magnetic field is due mostly due to electric currents in the molten iron outer core which are generated by interactions with other magnetic fields.  We know that the earth is not like a permanent magnet because its magnetic field reverses periodically, about every 100,000 to 200,000 years.\n.   There are four basic forces in physics: gravity, the electromagnetic force, the weak nuclear force and the strong nuclear force.  Gravity seems to be quite different from the other forces.  Quantum mechanics can explain the other three forces and demonstrate how, at very high particle energies, they could be a single force.  Gravity,so far, can not be united in theory with the other forces.
209689
mass in motion stays in motion unless disrupted by another force!
83668
There are several definitions of the word "force," but since your question is in the Other Science section, this should be the one you're looking for ---\n\nForce is a vector quantity; its size is measured in Newtons. One Newton will make a body of mass 1kg accelerate from rest to 1 metre per second, in a time of one second.
118764
Newtons 2nd Law,\nForce = mass * acceleration\n\nIf you have two masses (m1 & m2) that accelerate at the same rate,\nF1 = m1*a --> a = F1 / m1\nF2 = m2*a --> a = F2 / m2\n\nset both acclerations equal to eachother, solve for the ratio,\nF1/m1 = F2/m2\nF1 = F2 * m1 / m2 --> F1/F2 = m1/m2\n\nSo the ratio of Force 1 (F1) to Force 2 (F2) must equal the ratio of mass 1 (m1) to mass 2 (m2) in order for both to accelerate equally.
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Magnetic forces, electric forces are bi-polar: there are North and South poles on magnets, as well as positive and negative charges. As a result the forces can be attractive or repulsive.\n\nGravity is mono-polar in the sense that the force between two masses is always attractive.
187737
Actually there are four fundamental forces.  There are two kinds of nuclear force, strong and weak.  Also don't forget magnetism, you should say the electromagnetic force instead of electrostatic only.  Anyway, nobody knows the answer to this question yet.  It is still one of the outstanding questions in physics.  So have fun thinking about it, and see if you can come up with the answer.
92221
Gravity and electromagnetic forces.  Gravity is an odvious answer.  Most other forces, including frictional forces, fall under electromagnetic forces.  The strong and weak force mentioned earlier can not be experienced directly.  They come into play when dealing with radiation and sub-atomic physics.