force density and pressure Flashcards
(8 cards)
1
Q
define couple
A
a pair of equal and opposite coplanar forces that acts to produce rotation only.
2
Q
equation for couple
A
M = F *d
d= distance btw 2 forces
3
Q
what is equilibrium
A
- no resultant force
- sum of clockwise and sum of anticlockwise torques are equal at any point
4
Q
define density
A
mass per unit volume
5
Q
define pressure
A
normal force per unit area
6
Q
equation for hydrostatic pressure
A
∆p = ρg∆h
7
Q
how is upthrust created
A
due the difference of hydrostatic pressure on top and bottom of an object
8
Q
what is archimede’s principle
A
ß = ρ g V
ρ=density of liquid
V=volume of object under liquid
