what are the Plate boundary forces?
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Mantle convection moves the plates\n\nAt plate boundaries, there are many forces at work: ridge push, slab pull, trench suction, slab roll back and basal shear resistance to name a few.\n\nThe links go into more detail about the forces and where they working.
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1. Continental drift or plate tectonics.\n\n2. Horizontal fault line.
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The earth is split into plates. Whenever one moves, it will cause all the others to move. It eventually increases the number of earthquakes along a fault line until the plates settle down again. Eh, that's the typical fifth to tenth grade answer.
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Plates collide in areas called subduction zones.  At these zones, oceanic crust is subducted underneath continental crust due to its higher density.  Subduction results in great amounts of heat and pressure building up in the zone.  When these factors become strong enough, they are forced to the Earth's surface in the form of volcanoes.  That is why volcanoes typically occur along plate boundaries (e.g., the ring of fire).  However, volcanoes are not exclusive to plate boundaries.  They can also form over hot spots within the interior of the Earth.  The islands of Hawaii are an example.  The islands are formed on the Pacific Plate.  The plate is moving in a northwest direction, while the hot spot underneath the crust is stationary.  As the plate moves over the hot spot, volcanic eruptions occur.  The result is a new island being created.  The islands are actually the products of a series of shield volcanoes that grow in age as one moves to the northwest.
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The idea of Continental Drift was the forerunner of Plate Tectonics Theory. At the time that Wegener proposed the idea of Continental Drift, he did not have sufficient information to explain the physical mechanisms that would have allowed continents to break apart and drift apart. He did have fossil evidence, and shape-of-the continents evidence, and matching-rocks-on-both-sides evidence that the continents had indeed been juxtaposed. "A fatal weakness in Wegener's theory was that it could not satisfactorily answer the most fundamental question raised by his critics: What kind of forces could be strong enough to move such large masses of solid rock over such great distances? Wegener suggested that the continents simply plowed through the ocean floor, but Harold Jeffreys, a noted English geophysicist, argued correctly that it was physically impossible for a large mass of solid rock to plow through the ocean floor without breaking up."http://pubs.usgs.gov/gip/dynamic/historical.html\n\nLater, when scientists discovered magnetic striped on the ocean floor, learned more about the seismicity at trenches, and so forth, they were able to put together a more comprehensive model of the actual physical processes that could and do cause the continents to "drift" apart, or collide together. These processes come under the heading of Plate Tectonics--which includes the ideas of three types of plate boundaries, including the divergent boundaries with spreading ridges required for continents to "drift" apart. \n\n"From seismic and other geophysical evidence and laboratory experiments, scientists generally agree with Harry Hess' theory that the plate-driving force is the slow movement of hot, softened mantle that lies below the rigid plates. This idea was first considered in the 1930s by Arthur Holmes, the English geologist who later influenced Harry Hess' thinking about seafloor spreading. Holmes speculated that the circular motion of the mantle carried the continents along in much the same way as a conveyor belt. However, at the time that Wegener proposed his theory of continental drift, most scientists still believed the Earth was a solid, motionless body. We now know better. As J. Tuzo Wilson eloquently stated in 1968, "The earth, instead of appearing as an inert statue, is a living, mobile thing." Both the Earth's surface and its interior are in motion. Below the lithospheric plates, at some depth the mantle is partially molten and can flow, albeit slowly, in response to steady forces applied for long periods of time. Just as a solid metal like steel, when exposed to heat and pressure, can be softened and take different shapes, so too can solid rock in the mantle when subjected to heat and pressure in the Earth's interior over millions of years."http://pubs.usgs.gov/gip/dynamic/unanswered.html\nThe website below will give you illustrations and discusses both continental drift and plate tectonics.
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all of the above plus tectonic uplift for and plate boundry collision
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This would be false.\n\nIt has to do w/ convection currents in the mantle. This is the driving force behind plate tectonics.\n\nConvection currents are caused by uneven heating of molten rock in the mantle. As magma rises toward the crust, it becomes cooler & will then sink. As it sinks it will become hotter again causing a current to form.\n\nThis current actually moves the lithospheric plates. In some places where the lithospheric plates are broken they may be subducted but in others they will not. In this case (continental/continental boundaries) neither will be subducted. They will crumple up & deform. Many mountain ranges have been formed through continental/continental crust deformation.
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Deep-focus earthquakes are associated with convergent plate boundaries (subduction zones).\n\nSee source.
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look up plate tectonics
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The earth's crustal plates float on a layer called the Mantle, and it is convection in this mantle which drives the continental drift or plate tectonics.
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Types of plate movement:\nlateral (ie., San Andreas fault in CA) - side by side\nconvergent (ie.,Himalayan Mts.) - pushing together\ndivergent (ie., mid Atlantic Ridge) - pulling apart.\nCheck this site:\n\nhttp://www.northstar.k12.ak.us/schools/joy/denali/DAuria/plate_mvmt.html
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Giant rock plates pushing against each other suddenly slip causing the earth to move, sending out ripples like in a pond.\n\nChildren can recreate the action of a fault slipping with their hands.  Place both hands together, palm-to-palm.  Push the palms together.  While pushing the palms together, slide one hand forward away from the body while sliding the other hand back toward the body.  At first, nothing will happen.  As force is added to the forward-backward movement, the hands will suddenly slip, much as the earth does during an earthquake.
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The interactions between tectonic plates can cause earthquakes. Plate tectonics is the theory we use to explain how lithospheric or tectonic plates move. For example, two tectonic plates will build up stress (pressure) when their movement is impeded the eventual release of this stress causes an earthquake. There is more material available via Yahoo search. The second source link will help you get a good idea of the plate boundaries.
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In a subduction zone, one plate is being pulled under another. When continental crust & oceanic crust are involved, the oceanic crust is subducted b/c it is denser.\n\nThis type of stress is called compressional stress.\n\nIn the case of ocean ridges, like that found in the middle of the Atlantic Ocean, they are being pulled apart. That is a tensional stress. New crust is constantly being created there.\n\nIn the case of the San Andreas Fault, which is in the news a lot lately, it is two plates that are moving laterally. They are sliding past each other. This is a shearing stress.
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It happens in the brittle part of the crust, which is not usually deeper than 20 km.\n\nHere's the jist:\n\nIt all comes down to stress and strain. It is not 'the plates rubbing together' as many people say; or at least that's a very simplistic view.\n\nPlate tectonics causes stress on the continents and oceans, all over the surface of the earth. In some places, the stress is very small (usually within the plates). Elsewhere, the stress is high, usually where the plates meet each other. Since each plate moves, when two come in contact, the stress each other. They can push on each other and cause compressional stress, they can pull with extensional stress, and they can slide past or shear each other with tensional stress.\n\nFaulting, causing earthquakes, comes from the fact that this stress is building up all the time, but rocks and continents are strong materials. Just like hitting a rock with a small hammer, you do put stress on it, but a small amount. It would take a sledgehammer to put enough strain (effects and accumulation of stress) to build up and cause breakage. In the earth, the area around an active fault builds up strain from the stress of plate tectonics. Most faults become locked, because of this strength, and thus can not release their strain. Away from the fault, the stress produces very small and slow movement of the rock masses as a whole. Eventually, the strain is too much and the rest of the plate has moved too far and the fault releases the strain build-up all at once in a big stress release called an earthquake. This is called the elastic rebound theory, and it explains most (but not all) movements.\n\nThis is why an earthquake's size is relative to the fault size. The bigger the fault, the bigger the strain build up, and the bigger the release in an earthquake. Subduction zones and collision zones, where large portions of plates actually can rub together as a whole, have the really big earthquakes, like the 2004 Sumatra earthquake. In other plate boundaries, the entire plate boundary does not act together, so the faults become spread out and many faults take up the strain from the tectonic stress, like with the San Andreas Fault in California (it only takes up ~3/4 of the stress between the plates).\n\nEarthquakes are really tricky things; there is still so much we need to learn. As of now, there is no way to predict them, but we can say where the danger is highest and about how long between events.
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The foci of earthquakes at transform boundaries tend to be at shallow depths.\n\nSee source.
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How are they applied? Tangentially? In opposite direction? Or same?\nLet us assume oppo direc and on the border.\nThen net force=35N.\nTorque = r x F = I w\n=35x0.341= ''0.5'' m R^2\nR radius m mass\n ''Check if it is 0.5 only for a solid disk or cyliner about its axis.\n\nHope it helps