Pressure, Gravity and Moments
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| Density | The density of a substance is its mass per unit volume. D= M/V
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| Unit of Density | Kg m-3 kilograms per cubic metre
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| Pressure | Pressure is the force per unit area. P= F/A
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| Unit of pressure | Pascal or 1 Newton per square metre
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| Archimedes Principle | When an object is partially or completely immersed in a fluid it experiences an upthrus t equal in magnitude to the weight of the fluid displaced.
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| The law of flotation | The weight of a floating body is equal to the weight of the fluid it displaces.
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| Boyle's Law | At a constant temperature the volume of a fixed mass of gas is inversely proportional to its pressure.
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| Newton's law of Universal Gravitation | Any two point masses in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. F= Gm1m2/d2
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| Moment of a force | The moment of a force about an axis is equal to the magnitude of the force multiplied by the perpendicular distance from the axis to the line of action of the force. M= F x d
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| Unit of moment | Nm Newton metre
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| If a body is in equilibrium: | The vector sum of the forces in any direction is 0.
The sum of the moments about any point is 0
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| Couple | Two parallel forces with the same magnitude acting in opposite directions.
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| Moment of a couple (torque) | T = Fd
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Created by:
lottiexo
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