mechanics assumptions Flashcards
(6 cards)
1
Q
particle
A
> dimensions are negligible
so mass is concentrated at a single point
so rotational forces and air resistance negligible
2
Q
rod
A
> dimensions are negligible
rigid, will not bend/buckle
3
Q
uniform body
A
c.o.m lies in the geometric centre
4
Q
light (string/pulley)
A
> has no mass
tension is the same in both ends
5
Q
inextensible
A
> acceleration is the same in both ends (taut string)
6
Q
bead
A
> threaded on: tension is the same on both sides
knotted on: tension can be different
