MET 111 Purdue Final Quiz: Key Terms & Definitions

Scalar Quantity

Mass

For vector addition, you have to use which law

Parallelogram Law

When a particle is in equilibrium, the sum of forces acting on it equals

Zero

In statics, a couple is defined as __________ separated by a perpendicular distance.

wo forces of equal magnitude acting in opposite directions

If three couples act on a body, the overall result is that

The net force equals 0 but the net moment is not necessarily equal to 0.

A general system of forces and couple moments acting on a rigid body can be reduced to a

single force and a single moment

internal forces are _________ shown on the free body diagram of a whole body.

Never

f a support prevents translation of a body in a given direction, then the support exerts a ___________ on the body in the opposite direction.

Force

One of the assumptions used when analyzing a simple truss is that the members are joined together by __________.

Smooth pins

When using the method of joints, typically _________ equations of equilibrium are applied at every joint.

Two

n the method of sections, generally a "cut" passes through no more than _____members in which the forces are unknown.

3

If a simple truss member carries a tensile force of T along its length, then the internal force in the member is ______.

ensile with magnitude of T

Frames and machines are different as compared to trusses since they have _________.

At least one multi-force member

Forces common to any two contacting members act with ______ on the other member.

Equal magnitudes but opposite sense

A friction force always acts _____ to the contact surface.

parallel

If a block is stationary, then the friction force acting on it is _______.

greater than or equal to the friction force

A composite body in this section refers to a body made of ____.

A collection of "simple" shaped parts or holes

The composite method for determining the location of the center of gravity of a composite body requires _______.

Simple arithmetic

The definition of the Moment of Inertia for an area involves an integral of the form

Integral (x^2) dA

Select the correct SI units for the Moment of Inertia for an area.

m^4

The parallel-axis theorem for an area is applied between

An axis passing through its centroid and any corresponding parallel axis.

The moment of inertia of a composite area equals the ____ of the MoIe of all of its parts.

algebraic sum (addition or subtraction)