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Forces (pressure in a fluid (fluid - either a liquid or gas as their…
Forces
pressure in a fluid
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as depth increases the number of particles increases and the weight of these particles adds to the pressure felt
the more dense means it has more particles in a certain space so they collide more and the pressure is higher
a partially or totally submerged object experiences a greater pressure on the bottom surface than on the top surface, this makes a resultant force upwards called upthrust
moments
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if an object is balanced the total clockwise moment about a pivot equals the total anticlockwise moment about that pivot
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gears
they are circular disks with teeth around the edge which then interlock so that it causes another to move in the opposite direction
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atmospheric pressure
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as the altitude increases atmospheric pressure decreases as there are fewer air molecules that are able to collide with the surface
there are also fewer air molecules above a surface as the height increases which means that the weight of the air above it decreases with altitude
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speed / velocity
speed
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factors that affect it: age, fitness, distance
typical values:
- walking - 1.5 m/s
- running - 3 m/s
- cycling - 6 m/s
- car - 25 m/s
- train - 55 m/s
- plane - 250 m/s
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