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14 Cards in this Set
- Front
- Back
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Density |
- is mass per unit volume - kilogram per cubic metre |
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Pressure |
- is force per unit area - pascal (Pa) or newton per metre squared |
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Pressure in a Liquid |
- (Density) (Gravity) (Depth) |
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Pressure in a Liquid ( does what? ) |
(1). Increases with depth (2). Acts equally in all directions (3). Acts perpendicular to any surface |
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Upthrust / Buoyancy Force |
if an object is immersed in a liquid (or gas) there is an upward force acting on it due to the liquid (or gas). |
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Archimedes’ Principle |
states that when an object is immersed in a fluid it experiences an upthrust equal to the weight of the fluid it displaces. |
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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 |
states that for a fixed mass of gas at constant temperature, the volume is inversely proportional to the pressure. |
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Newton’s Law of Universal Gravitation |
states that any two point masses in the universe attract each other with a force that is : - directly proportional to the product of their masses - inversely proportional to the distance between them squared. |
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Moment of a Force |
Magnitude of Force x Perpendicular Distance |
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Body is in Equilibrium if ... |
(1). The vector sum of the forces in any direction is zero. (2). The sum of the moments about any point is zero. |
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Couple |
two parallel forces with the same magnitude (size) acting in opposite directions. |
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Moments of a Torque |
Force x Distance between parallel forces. |
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Lever |
a rigid body which is free to rotate about a fixed point (fulcrum). |
