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Friction
Well, sand starts as pebbles and rocks. These rock then grind against each other breaking smaller & smaller until you get sand.
Tension cx
The windmill's blades act like a rotating fan which pushes the rod attached to it to the direction the wind is blowing. As it goes to the end of the rod, the stone, which is attached to the rod too spins. This causes the two stones which are joint together crush and grind the grain between them.
With the ancients as 'windmills' to grind corn/wheat etc., and to drive up water.
no
Friction
Friction
Yes, cars have less friction when they roll on the ground than when the breaks are on (sliding). That's why breaks stop the car, because the sliding friction of rubber on asphalt is very high.
Mastication (when teeth cut and grind food) is a physical change.
First stab then crush. To thrust is to penetrate fully, when that has been achieved the grind is when you as the male, gently grind your pubic bone against that of your partner [female].
It is called Abrasion.
Slickensides is the geological term for the shiny surfaces, often showing linear grooves, on one or both surfaces of rock faces as they grind past each other during fault movement. The surfaces are characterized by pulverized rock compressed to a smooth and often shiny surface.
Friction originates from the fact that everything is rough at a small enough scale. When these rough parts grind against each other, something must move out of the way, since every force results in motion. When something does give, part of the force is used, and since the scale is so small, heat is created as individual molecules move.
Earthquakes are caused when this happens.
the shaking of the earthquake
because you have uneven joint surfaces, which isn't anything to worry about. and lol, vital signs. stop being so dramatic.