ENGINEERING MECHANICS Flashcards
also called Coulomb friction, occurs when unlubricated surfaces of two solids are in contact and slide or tend to slide from each other. If lubricant separates these two surfaces, the friction created is called lubricated friction. This section will deal only with dry friction.
DRY FRICTION
occurs when layers of two viscous fluids moves at different velocities. The relative velocity between layers causes frictional forces between fluid elements, thus, no fluid friction occurs when there is no relative velocity.
FLUID FRICTION
also called friction drag is a component of the force resisting the motion of a solid body through a fluid.
SKIN FRICTION
is associated with shear deformation of the solid materials subjected to cyclical loading. As deformation undergo during loading, internal friction may accompany this deformation.
INTERNAL FRICTION
A force indicates the amount of force (expressed as N or kN) that will be exerted on another body
MAGNITUDE
The direction in which it acts
Direction
The nature of force may be tensile or compressive
Nature
The point at which the force acts on the body is called ?
Point of Application
used to locate the position of a point in space and thereby describe the size of a physical system.
Length
conceived as a succession of events.
Time
A measure of a quantity of matter that is used to compare the action of one body with that of another.
Mass
considered as a “push” or “pull” exerted by one body on another.
Force
A branch of the physical sciences that is concerned with the state of rest or motion of bodies that are subjected to the action of forces.
Mechanics
Deals with the equilibrium of bodies, that is, those that are either at rest or move with a constant velocity
Statics
Concerned with the accelerated motion of bodies.
Dynamics
Defined as the science which describes and predicts the conditions of rest or motion of bodies under the action of forces.
Engineering Mechanics
A branch of Engineering
Mechanics in which we consider the effects
and distribution of forces on rigid bodies
which are and remain at rest.
Statics
A branch of Engineering Mechanics
in which we consider the various motions of rigid bodies and the correlation of these
motions with the forces causing them.
Dynamics
A branch of Engineering
Mechanics that studies the position,
acceleration and speed of an object.
Kinematics
A branch of Engineering
Mechanics that studies the cause of
motion of an object.
Kinetics
The action exerted by one body upon
another.
Force
All forces on the certain body lies
in one plane
COPLANAR
Forces act or lie in two or
more plane
NON COPLANAR
All forces lie only in one point
CONCURRENT
All forces originates or
coming from different point
NON CONCURRENT
All forces are parallel to each
other.
PARALLEL
A force diagram, which is also known as a free body diagram, is a sketch in which all the force vectors acting on an object are drawn with their initial points at the location of the object.
FREE BODY DIAGRAM
FREE BODY DIAGRAM IS ALSO KNOWN AS A
FORCE DIAGRAM
Determines the motion of the
body. Overall results or overall effect of the
forces on a certain body
RESULTANT
