Force

parallel forces

Non concurrent forces having parallel lines of action

Lever

rigid element that about the fulcrum to exert a pressure or sustain A weight at the second point by a force applied at the third

fulcrum

the point or support in about which Lever turns

Concurrent forces

forces having lines of action intersecting at a common point, the vector sum of which can be found by applying a parallelogram law

Coplanar forces

forces that operate in a single plane

component of a force

Two or more concurrent forces into which single force may be resolved and having a net effect on a rigid body equivalent to that of the initial force. For convenience in structural analysis, these are usually the rectangular or cartesian component of the initial Force

Polygon method

a graphic technique for finding the vector sum of a coplanar system of several concurrent forces by drawing to scale each force vector in succession, with the tail of it at the head of the one preceding it, in completing the polygon with a vector that represent the resultant force , extending from the tail of the first to the head of the last vector

Triangle method

a graphic technique for finding the vector sum of two concurrent forces by displacing one force vertor parallel unit to itself until its tail coinside with the head of the other and completing the triangle with a vector that represents the resultant force

Center of gravity

a point at which the entire weight of the body may be considered concentrated so that, if supported at this point, the body would remain in equilibrium in any position, coinsident read the center of mass in a uniform gravitational field, force whose line action passes through the center of gravity of a body affect only its translational equilibrium, the body remains in rational equilibrium

Vector

a quantity possessing both magnitude and direction, represented by a arrow whose length is proportional to the magnitude in whose orientation in space represent the direction

dynamics

the branch of mechanics that deals with the motion and equilibrium of bodies or materials you stand under the action of forces

Newton's second law of motion

the physical law that the sum of the forces acting on the body is equal to the product of the mass of the body and the acceleration produced by the force,with motion in the direction of the resultant of the forces

Translation

the uniform motion of the body in a straight line, without rotation or angular displacement

Free body diagram

A graphic representation of the complete system of applied and reactive forces acting on the body or an isolated part of a structure. Every elementary part of a structure system has reaction that are necessary for the equilibrium of a part, just as the large system has reactions at its support that serve to maintain the equilibrium of the whole. Also called equilibrium diagram

Line of action

A line of indefinite length of which a force vector is a segment. A force acting on a rigid body may be regarded as acting anywhere along its line of action without altering the external effect of the force

vector sum

A single vector equivalentand producing the same effect on a body as the application of two or more given vectors. Also called resultant

Equilibrium

A state of balance where is resulting from the equal action of opposing force

Applied force

An external force acting directly on the body

Reactive force

An external force generated by the action of one body on another

Force

An influence on the body producing or tending to produce a change in shape or movement

Couple

Force system of two equal, parallel forces acting in opposite direction and tending to produce rotation but not translation.

Non concurrent forces

Forces having lots of action that do not intersect at the common point, the vector sum of which is a single force that would cause the same translation and rotation of the body of the set of original forces

statistically equivalent

Having the same translation of invitation of the effect on the body

Statistic

The branch of mechanics that deals with the relation of forces producing equilibrium among buddies or material system

Mechanic

The branch of physics that deals with the effect of forces on bodies or material systems comprised of statics to in dynamics

Centroid

The center of a one or two dimensional figure about which the sum of the displacement of all points in the figure is zero

rotation

The circular motion of a body about an axis

equilibrant

The force required to bring a set of concurrent forces into equilibrium, equal in magnitude but opposite in direction to be the resultant of the concurrent force system and acting along the same line of action

Moment center

The perpendicular distance from the line of action of the force to the point or line about which a moment occurs. also called force arm

Newton's first law of motion

The physical law that a body remains at rest or in motion with a constant velocity unless an external force acting on the body. Also called law of inertia

Center of mass

The point at which the entire mass of the body may be considered concentrated such that the moment about any line through this zero

parallelogram law

The proposition that the vector sum of two concurrent forces can be described by the diagonal of a parallelogram having adjacent side that represent the two force vectors being added

Mechanical advantage

The ratio of output force to the input force applied to a mechanism

Moment

The tendency of a force to produce the rotation of a body about a point or line, equal in magnitude to the product of the force and the moment arm and acting in a clockwise or counterclockwise direction

Inertia

The tendency of the body at rest to remain at rest of the body in motion to retain its velocity along a straight line unless acted upon by an external force

Newton's third law of motion

The the physical law. For every force acting on the body, the body exert a force having equal magnitude in the opposite direction along the same line of action of the original force, also cold the law action and reaction

Collinear forces

concurrent forces having the same line of action the vector sum of which is the algebraic sum of the magnitude of the forces, and acting along the same line of action