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# Physics ch10

### Pressure, Gravity and Moments

TermDefinition
Density The density of a substance is its mass per unit volume. D= M/V
Unit of Density Kg m-3 kilograms per cubic metre
Pressure Pressure is the force per unit area. P= F/A
Unit of pressure Pascal or 1 Newton per square metre
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.
The law of flotation The weight of a floating body is equal to the weight of the fluid it displaces.
Boyle's Law At a constant temperature the volume of a fixed mass of gas is inversely proportional to its pressure.
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
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
Unit of moment Nm Newton metre
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
Couple Two parallel forces with the same magnitude acting in opposite directions.
Moment of a couple (torque) T = Fd
Created by: lottiexo