the three type of rocks forces of AIR.
There are three main forces that drive deformation within the Earth. These forces create stress, and they act to change the shape and/or volume of a material. The following diagrams show the three main types of stress: compressional, tensional, and shear. Stress causes the build up of strain, which causes the deformation of rocks and the Earth's crust. Compressional stresses cause a rock to shorten. Tensional stresses cause a rock to elongate, or pull apart. Shearstresses causes rocks to slip past each other.
Gravity, magnetism, and electrostatic.
Electro-staticMagnetismGravity
Wind, rain, heat
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Coplanar just means that all forces act within a single plane, rather than in three dimensions. Examples aren't really necessary -- it's really a mathematical abstraction, because in the real world forces act in three dimensions.
Coplanar forces systems have all the forces acting in one plane. It also means that all forces act within a single plane instead of three dimensions.
The forces that break rocks vary and in most cases are classified as mechanical or chemical forces. Weathering is one of the common ways that rocks are broken down into smaller particles.
Forces don't act on other forces - forces act on objects.
There are three types of rocks: 1)Igneous Rocks 2)Sedimentary Rocks 3)Metamorphic Rocks