Physics Density + Pressure

Question 0

Pressure

Answer 0

Amount of force acting on a unit of area
P= f/a
Unit- pa (pascal)

Question 1

Density

Answer 1

Mass per unit volume
M/v
Unit kg(m3)

Question 2

Pressure in liquid

Answer 2

= pgh
Density( 9.8) (depth)
Increases with depth

Question 3

Archimedes principle

Answer 3

When a body is partially or completely immersed in a fluid it experiences an upthrust equal to the weight of fluid displaced

Question 4

Upthrust / buoyancy

Answer 4

Upwards Force on a body due to a liquid

Question 5

Law of flotation

Answer 5

Weight of a floating body , is equal to the weight of fluid displaced

Question 6

Hydrometer

Answer 6

Follows law of flotation floats higher on denser liquid
Used in finding:
% alcohol in beer, wine etc
% milk in milk

Question 7

Bends

Answer 7

Humans are accustomed to normal atmospheric pressure , when diving deep, and they come up too quickly, too much nitrogen is absorbed in the blood , forming bubbles hurts + can kill
Cure decompression chamber

Question 8

Boyles law

Answer 8

The volume of a fixed mass of gas is inversely proportional to it’s pressure at a constant temperature
Know experiment + graph

Question 9

Atmospheric pressure

Answer 9

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