Pressure

Question 1

Equation for Pressure

Answer 1

Force/Area

Question 2

Example of pressure in relation to force and area

Answer 2

The pointed end of a high heel exerts more pressure than the flat end as the force is acting over a smaller area at the pointed end

Question 3

How to find atmospheric pressure

Answer 3

Mercury Barometer-balancing the weight of mercury in the glass tube against the atmospheric pressure. If the weight of the mercury is less than atmospheric pressure, it rises.

Question 4

Relate how pressure beneath a liquid surface change with depth and density

Answer 4

The pressure exerted by a liquid increase with increasing depth inside the liquid. With increasing depth, the density is larger

Question 5

Use appropriate example to relate pressure beneath a liquid surface to depth and density

Answer 5

In the ocean, the pressure exerted by water increases with increasing depths. As the density of the water increases, the pressure of the water increases

Question 6

What is the use of a manometer

Answer 6

Manometer is an instrument used to measure air pressure

Question 7

Formula for liquid pressure

Answer 7

Height x density x gravity(10)

Question 8

Describe air pressure in relation to Altitude

Answer 8

As altitude increaces, air pressure is lower as most gas moloucles in the atmosphere is pulled close to the eart surface by gravity. Thefore the density of gas particles at lower altitude is higher than higher altitudes.

Question 9

Why are airplanes pressurized

Answer 9

It protect passagngers and crew from Hypoxia-When body is deprived of oxegen

Question 10

Why are airplanes not pressurized to sea level

Answer 10

It decreaces the aircraft life as there would be more pressure put on the aircraft due to the larger pressure difference which will result in the plane having to be heavier, decreacing effeciency and burning more fuel