Pressure

Question 1

Pressure

formulas

Answer 1

pressure is defined as the thrust acting per unit area od the surface. P=F/A

Question 2

factors affecting pressure

Answer 2

thrust and area. pressure id directly proportional to force because when force increases pressure increaces. pressure is inversly proportional to area because when area increases force decreases and when area decreases force decreases.

Question 3

atmospheric pressure

Answer 3

the pressure exerted by atmosphere due to its weight is called atmospheric pressure,

Question 4

importance of atmospheric pressure

Answer 4

• helps to fill ink in the ink pen
• helps to fill medicine in the syringe
• helps fill air in the tyre.
• helps lift water using water pump
• helps to drink soft drinks using staw

Question 5

liquid pressure

Answer 5

the thrust exerted by a liquid per unit area of the surface is called liquid pressure.

Question 6

liquid pressure depends on

Answer 6

height of liquid column/ depth of liquid column (h)
density of liquid (d)
acceleration due to gravity (g)

Question 7

properties of liquid pressure

Answer 7

• it increases with increase in height of liquid column
• it is transmitted equally in all directions when pressure is applied in the liquid kept in a container
• it is directly propertional to density of liquid
• it determines its own level

Question 8

density (formula)

Answer 8

• it can be defined as the mas per unit volume of the substance. D=m/v

Question 9

relative density

Answer 9

the relative density of a substance is the ratio of the density of substance to the density of pure water.
- relative density has no unit because it is the ratio of two density