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Pressure & Moments

LC Physics (Pressure, Gravity and Moments)

TermDefinition
Density Mass per unit volume
Pressure Force per unit area
1 Pascal 1 newton per square metre
Archimedes' Principle When an object is partially/completely immersed in a fluid then it will experience an upthrust equal in magnitude to the weight of the fluid displaced.
Law of Flotation The weight of a floating object is equal to the weight of the fluid displaced.
Hydrometer Instrument used to measure density of a liquid when compared to water.
Boyle's Law Pressure of a fixed mass of gas is inversely proportional to its volume at a constant temperature.
Newton's Universal Law of 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.
Moment (Force)(perpendicular distance) This is the turning effect of a force.
Laws of Coplanar Forces When a body is in equilibrium: 1.The vector sum of the forces in any direction is zero (Net forces = 0) 2. The sum of the moments about any point is zero (Sum of clockwise moments = sum of anti-clockwise moments) Also known as laws of equilibrium.
Couple Two parallel forces with the same magnitude acting in opposite directions.
Torque (force)(perpendicular distance between the couple)
Equilibrium A body is in equilibrium when it is not accelerating.
Barometer Instrument used to measure atmospheric pressure.
Created by: mduffy13
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