MECHANICAL ENGINEERING EXAM 1
QUESTIONS AND CORRECT ANSWERS.
what is the same as a hinge
pin
how many reaction forces does a roller have
1
type of problem when the # of unknowns > # of equations
statically indeterminate
type of problem when # of unknowns < # of equations
unstable equilibrium
what direction is the reaction force of a roller
perpendicular to the point of contact at surface
a rocker is the same reaction force as a ___
roller
a connector is ___ from the body
either towards or away
the reaction force for a connector is ____
perpendicular to the rod
reaction force of a smooth contacting surface
perpendicular to the surface
a smooth contacting surface has how many reaction forces
one
in 2d a hinge and a pin will have reaction forces of ....
, fx and fy
in 2d, a fixed support will have how many unknowns
three
what are the three reaction forces of a fixed support in 2d
fx, fy, moment
as done in lecture on review day, if you have a fixed support at a certain
point, you have the reaction components of fx and fy, but what should
you make the reaction moment about (Ex: at point A), so therefore what
would you call the reaction moment
about point A, Mra
how many unknowns for a fixed support in 3d
six
two forces that are equal and opposite and cause rotation
couple
what is the resultant force of a couple
zero
a couple is a ____ vector and therefore can be appilied at ___ point
free, any
is the resultant moment of a couple zero?
no
what is the formula for the moment of a couple
M = Fd
what is the formula for the moment of two couples (in 2d) assuming the
distance between couples is perpendicular distance
(F1d) + (F2d)
QUESTIONS AND CORRECT ANSWERS.
what is the same as a hinge
pin
how many reaction forces does a roller have
1
type of problem when the # of unknowns > # of equations
statically indeterminate
type of problem when # of unknowns < # of equations
unstable equilibrium
what direction is the reaction force of a roller
perpendicular to the point of contact at surface
a rocker is the same reaction force as a ___
roller
a connector is ___ from the body
either towards or away
the reaction force for a connector is ____
perpendicular to the rod
reaction force of a smooth contacting surface
perpendicular to the surface
a smooth contacting surface has how many reaction forces
one
in 2d a hinge and a pin will have reaction forces of ....
, fx and fy
in 2d, a fixed support will have how many unknowns
three
what are the three reaction forces of a fixed support in 2d
fx, fy, moment
as done in lecture on review day, if you have a fixed support at a certain
point, you have the reaction components of fx and fy, but what should
you make the reaction moment about (Ex: at point A), so therefore what
would you call the reaction moment
about point A, Mra
how many unknowns for a fixed support in 3d
six
two forces that are equal and opposite and cause rotation
couple
what is the resultant force of a couple
zero
a couple is a ____ vector and therefore can be appilied at ___ point
free, any
is the resultant moment of a couple zero?
no
what is the formula for the moment of a couple
M = Fd
what is the formula for the moment of two couples (in 2d) assuming the
distance between couples is perpendicular distance
(F1d) + (F2d)
