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Forces in Fluids
- 2. Review Newton’s Laws Explanation Summary First The velocity of an object will not change unless it is acted on by an unbalanced force. inertia Second When an object is acted on by an unbalanced force, it will accelerate in the direction of that force. F=ma Third For every action there is an equal and opposite reaction. action-reaction
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- The stronger the attraction, the less freely the particles flow past one another and the more viscous the fluid is.
- Example: if a force of 1 Newton was applied by the thumb to the nail, what would be the pressure of the two ends of the nail? Let’s say the nail head is 10 meters sqaure and the point is 1 square meter. P head = 1/10 Pascals and P point = 1/1 Pascals
- The pressure at a certain depth in the liquid is the same at all points at that depth. Pressure at A = Pressure at B = Pressure at C = Pressure at D = Pressure at E Notice that it is only the depth of the liquid that matters; not the angle of the tube, the cross sectional area of the liquid column or the area of the liquid surface.