Engineering Science

Rubber

Which of the following is a “non-hookean” material?

If the resultant force acting on a particle is zero, the particle remains at rest (if originally at rest) or will move with constant speed in a straight line (if originally in motion)

Newton’s First Law of Motion states that:

Center of gravity

The point through which the whole weight of the body acts is called ______

1 MPa

A block 100mm x 100mm base and 10mm height. What will be the direct shear stress in the element when a tangential force of 10kN is applied to the upper edge to a displacement 1mm relative to the lower face?

Hooke’s Law

States that strain produced within elastic limits is proportional to the stress producing it.

Normal Stress

The stress which acts in a direction perpendicular to the area.

Shear Force Diagram

A diagram which shows the variations of the axial load for all sections in the span of a beam

Equilibrium

A condition in which the resulta

True

True or False: Statics of rigid bodies is the study of materials, objects, or particles at rest or moving under constant velocity

Rigid Body

A combination of large number of particles in which all particles remain at a fixed distance from one another before and applying a load

+96lb; +64lb

-225.90 N

If the x- and y- components of the forces on the figure shown are -105 N and -200 N, respectively, what is the magnitude of the resultant force? (w/diagram)

Varignon’s Theorem

States that the moment of a force about a point is equal to the sum of the moments of the force’s components about _____

Tensile

When equal and opposite forces applied to a body tend to elongate it, the stress produced is ______

Yielding Point

Stress at which extension of a material takes place more quickly as compared to the increase in load

3.33 kN

kN/m

SI unit for bending moment.

Weight

Refers to the gravitational force (attraction) of the earth acting on a body.

16 kN

In the figure below, find the reaction at point A or Ra (refer to the next question’s diagram)

-9 kN

Bending stress is the same at every section along its longitudinal axis

5250 lbs

In the figure below, if the system is in equilibrium, what is Fbc=?

Neutral Axis

In a beam, which layer is neither elongated nor shortened during bending?

Free Body Diagram

A _____ isolates a body from its surroundings, and one considers all the forces and only those forces, acting on the body.

3

In a body loaded under plane stress conditions, how many independent stress components are present?

3

A man raises a 10kg joist, of length 4 m, by pulling on a rope as shown in the picture. How many concurrent forces are acting upon the joist

kN

SI unit for shear force

Rigid

A ______ body is one which does not deform. The distance between the individual particles making up the body remains unchanged under the action of external forces.

97.73 N

False

The types of normal stresses are shear and bending

Hooke’s Law

Stress is proportional to strain.

Strength of materials

Deals with the relation between externally applied loads and internal.

Continuous Beam

A type of beam with at least three or more supports.

Simple Beam

A beam that is simply supported at both ends is called ____.

First degree

Zero Degree

What kind of curve is a uniformly distributed load if you plot it in a shear diagram?

Beam Deflection

Second moment of area is an important value which is used to ___.

5N

Two forces 3 N and 4N are perpendicular to each other the resultant of the two forces is ___.

Vector Quantities

Quantities having both magnitude and direction.

Moment

Measure of tendency of a force to make a rigid body to rotate.

Concurrent

Force system whose line of action pass through common point.

Zero Stress

Centroid is also called the axis of ________.

Shear

Moment of inertia is used for the stress calculations of ____.

Free Body Diagram (FBD)

Sketch of a body completely isolated.

Proportional Limit

The safe load the material can carry.

Triangular load

The intensity of loading increases or decreases at a constant rate.

Rigid Body

It is defined as a definite amount of matter the parts which are fixed in position relative to each other.

Fixed Beam

It is a type of beam which is restrained at both ends

Determinate Beam

Cantilevered beam is considered as.

Principle of Transmissibility

The external effect of a force in a rigid body is the same for all point along its line of action.

Torsional

When a machine shaft is subjected to torque, the stress is _______.

Area Moment of Inertia

Can be calculated if we have a rectangular coordinate system, one can define the area moment of interial around the axis.

Equilibrium

The state or condition in a body wherein the resultant is zero.

Modulus of Elasticity

The slope of the stress and strain.

Reaction Force

Force that inhibits change in the state of movement of a body.

Varignon’s Theorem

This theorem states that the moment of a resultant of two children concurrent forces about any point is equal to the algebraic sum of the moments of its components about the same point.

Tangential

Bolt double shear is an example of what stress?

Strain

the geometric measure of deformation representing the relative displacement of particles within a body subjected to an external force.

KN-m

What is the unit of torque?

Length

Strain is deformation divided by _______.

Zero Force member

Some members in the truss which cannot carry load.

Stable

Centroid is used to determine if the building is:

Method of Joints

This method uses the free body diagram of joints in the structure to determine the forces in each member.

Rigidity

Deformation is a measure of the material’s ______________

Newton

Unit of force.

Break

Strength of materials refers to the tendency of the structure not to _______.

Cantilever Beam

A type of beam with at least three or more supports.

Pascal

What is the unit of stress?

Equilibrium Equation for a Particle

A particle is in equilibrium if the resultant of all forces acting is equal to zero.

Magnitude

It is the intensity of the force.

System of Forces

When several forces act in a given situation.

Truss

It is a structure made of two force members all pin is connected to each other,

Overhanging Beam

A type of beam with either or both ends extending beyond the support.

Parallelogram Law

The resultant of two forces which is the diagonal formed on the vectors of this force.

All of the Choices

The second moment of area is an important value which is used to _________ It can also be called moment of inertia.

Concurrent, Coplanar

The action lines of all the forces are in the same plane and intersect a common point

Center of Gravity

It is a point within an object from which the force of gravity appears to act.

lie somewhere along the line of symmetry.

If an area has one line of symmetry the centroid will

Bearing Stress

Is a contact pressure between separate bodies.

Concentrated Load

A kind of load that acts over a small distance that it can be assumed to act at a point.

Newton’s 3rd Law

Each action has a reaction equal in magnitude and opposite in direction

Centroidal Axis

An axis passing through the centroid of an area is known as a __________

Moment

The measure of tendency of a force to make a rigid body rotate about a fixed axis

246000kPa

A 5cm-diameter 80cm long steel bar is restrained from moving. If its temperature is increased 100 deg. C, determine the induced compressive stress? For steel = 11.7 x 10.6 per degree C, E = 210 GP

1.5 N/mm

For a uniformly distributed load of 1.5 KN/m, what is the equivalent load of this N/mm

all of the choices

Stress is proportional to Strain

Shearing

A stress that is caused by forces acting along or parallel to the area of resisting forces

65973 N

What is the allowable load in kN on a 2-cm diameter, 1m long steel rod if the maximum elongation is limited only to 0.10cm. (E for steel = 210 x 10^kPa)

Proportional Limit

The straight line portion from the origin up to the elastic limit of the stress-strain diagram is termed as the __________ .

Elastic Limit

The tress beyond which the material will not return to its original space when unloaded.

Factor of safety

The ratio of this strength (ultimate or yield strength) to allowable strength is called.

Yield Point

It is a point on the stress-strain diagram in which there is an appreciable elongation of the material without any corresponding increase of load.

0.00686

An elevator is suspended by a 2-cm-diameter, 30-m long steel cable. If twenty five people with a total weight of 15000 N, how far in millimeters does the elevator drop?

Ultimate Strength

It is the highest ordinate on the stress-strain curve as maximum strength.

Unitless

What is the unit of strain?

Hooke’s Law

In linear portion, stress directly proportional to strain is given in what law?

Modulus Elasticity

The slope of the straight line portion of the stress-strain diagram is the ratio of stress to strain is called.

It is elastic

A specimen is subjected to a load when the load is removed. The strain disappears. From this information, which can be deducted about the material?

Beams

In structures, these are members primarily designed to resist bending moment.

Columns

Generally, vertical structural members and resist axial compressive loads.