chapter 5 pressure

Question 1

pressure is the concentration of a force

Answer 1

• force spread over large area will result in small pressure
• force spread over small area will result in large pressure

Question 2

pressure equation

Answer 2

pressure is a force acting per unit area at right angles to surface

pressure = force / area (pressure will increase if area decreases and opposite)

Question 3

pressure formula triangle

Answer 3

force (top)

pressure and area (bottom right/left)

Question 4

units of pressure and units of area

Answer 4

area=cm or m and final N/cm^2 or N/m^2 (because of force measured in Newtons 
1 Pa (pascals) = 1N/M^2

Question 5

pressure in liquids

Answer 5

• object immersed in liquid, liquid exert a pressure , squeezing the object
• pressure from water will exert across the entire surface evenly

Question 6

equation for pressure in water

Answer 6

pressure = hPg (p=density, should be weird p)
density (kg/m^3)
Depth (m)
pressure (pa)

Question 7

manometer (u-Tube)

Answer 7

device used to measure other pressures
-consists out of mercury
-one end open to atmosphere
other end connected to pressure which needs to be measured

Question 8

barometer

Answer 8

device which is used to measure air pressure

• mercury in inverted tube sat on a tray exposed to the atmosphere
• the weight of the mercury in the tube is balanced by atmospheric pressure pushing on the mercury on the tray
• atmospheric pressure increases = greater length of mercury can be supporting the tube
• atmospheric pressure decreases = less mercury will supported the tube