SRB Q1 Flashcards
is a branch of mechanics which studies the effects and distribution of forces of rigid bodies which are and remain at rest
Statics
is the physical science which deals with the effects of
forces on objects
mechanics
primarily concerned to system of forces applied to body at rest.
statics
is the study of body in motion
dynamics
is the action of one body on another
force
tends to move a body in the direction of its action.
force
are those which are applied to the boundary of a structure. This
includes explicit externally applied forces as well as the forces that are applied by the supports to restrain the structure.
external forces
are those that are exerted on a portion of a structure by the rest of
the structure. You would only see these forces if you were to make a cut in the structure and separate it into two free body diagrams
internal forces
is a body of negligible dimensions. It is a
body whose dimensions are considered to be near zero so that we may analyze it as a mass concentrated at a point.
particle
when the change in distance between any two of its points is negligible for the purpose at hand
rigid body
are those with which only a magnitude is associated
scalar quantities
are those possess direction and magnitude, and must obey the
parallelogram law of addition as described later in this article
vector quantities
A force may be moved anywhere along its line of action without changing its external effects on a rigid body
PRINCIPLE OF TRANSMISSIBILITY
is the measure of the capacity or ability of the force to produce twisting or
turning effect about an axis
moment
The moment produced by two equal, opposite, and non collinear forces is called a
couple
is a system of forces whose magnitude of the resultant is zero and yet
has a moment sum
couple
refers to the number of forces which remain in same plane
coplanar force
is a group of forces of which all are on the same
plane, and all forces intersect in a single common point.
concurrent force system
is the simplest force combination which can replace
the original forces without altering the external effect on the rigid body to which the forces are applied.
resultant of a system of forces
refers to the number of forces which are parallel to
each other with their lines of action.
parallel coplanar force system
states that the moment of a force about a point is equal to the sum
of the moments of the components of the force about the point.
Varignon’s theorem
refer to the number of forces which are not parallel and do not lie at the common point with their lines of action.
Non-concurrent and non-parallel coplanar force systems
