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14 Cards in this Set
- Front
- Back
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What is Density?
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Mass per unit volume.
It is the measure of the compactness of a substance. The mass to how much space it takes up. |
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What is the equation for density?
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Density = mass/ volume
The letter for density looks like a p but it isn't |
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What are the units of Density?
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g/cm 3 or kg/cm 3
1kg/cm3 = 1000 g/cm3 |
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What does density depend on?
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What it's made of (NOT SIZE OR SHAPE)
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What does the average density of an object do?
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Determines whether is sinks or floats!
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How can you work out the volume of an oddly shaped object?
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Use a displacement can or measuring container . Look for volume of displaced or rise in volume.
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What is pressure?
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Force per unit area. It is a measure of the force being applied to the surface of something.
How much force applied to something in Newtons! |
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What are the units of measure for pressure?
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N/m2 or pascals (Pa)/ kilopascals (kPa)
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what's the equation for pressure?
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pressure = force / area
p = FA |
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So what happens if same force is applied over larger area?
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Lower pressure
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How does pressure act in gases and liquids?
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The pressure at any point acts equally in all directions.
Pressure increases with depth. |
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What is pressure difference?
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The difference between two points in a liquid or gas
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What does pressure difference depend on?
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height difference (m) and density (kg/m3) of substance. Gravity has an effect too (10m/s2).
Pressure diff = height (m) x density (kg/m3) x g (N/kg) |
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Find the pressure difference between the top and bottom of a 3m vertical column of water. Density of water is 1 g/cm3.
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p diff = height (m) x density (kg/m3) x g (N/kg)
so density of 1 g/cm3 in kg/m3 = 1 /100 * (100 * 100 * 100) = 1000kg/m3 p diff = 3 x 1000 x 10 = 30000 Pa (N/m2) |
