P11 - Force and Pressure Flashcards
(8 cards)
1
Q
formula
pressure
A
p = F / A
2
Q
name
unit of pressure
A
Pa (Pascals)
3
Q
how does pressure change in a fluid column
A
pressure of the fluid increases with depth
4
Q
pressure column formula
A
p = hρg
pressure = height * density * GFS
5
Q
name
pressure at sea level
A
100kPa
6
Q
define:
upthrust
A
fluid exerting an upwards force on a body
7
Q
explain:
why some objects sink or float
A
- an object’s density is higher than the fluid’s
- so its weight is greater than the weight of fluid displaced
- so weight > force of upthrust
8
Q
explain:
why upthrust occurs
A
the difference in pressure between the top and bottom of an object submerged in a fluid
