Lesson 1

Question 1

It is a part of ENGINEERING MECHANICS and is considered as the science that considers the effects of forces upon rigid bodies (static condition-NO MOTION).

Answer 1

Statics of Rigid Bodies

Question 2

It pertains to the effects and distribution of forces on bodies which are at rest/remain at rest.

Answer 2

Statics

Question 3

It deals with the study of the motion of rigid bodies caused by forces acting on them.

Answer 3

Dynamics

Question 4

It pertains to the definite amount of matter (solids), the parts of which are fixed relative to each other.

Answer 4

Rigid body

Question 5

It requires a great magnitude of a force to cause its disassembly

Answer 5

Rigid body

Question 6

What are the prime examples (2) of a rigid body?

Answer 6

TRUSSES of structures and FRAMES of machines

Question 7

TRUSSES OR FRAMES?
It is for larger structures (houses, buildings) having multiple number of parts (bolted, riveted, or welded). It is also subject to a variety of loads

Answer 7

TRUSSES

Question 8

TRUSSES OR FRAMES?
It is for smaller strictures (machines) having less no. of parts (bolted, riveted, or soldered). Subject to some loads

Answer 8

Frames

Question 9

What are the variety of loads?(5)

Answer 9

1. Dead load- weight of structural components
2. Live load- weight of the occupants
3. Wind load- + or - wind loads
4. Earthquake load
5. Snow load

Question 10

It is a definite amount of matter (solids), the parts of which are just placed relative to each other.

Answer 10

non-rigid body

Question 11

It requires a lesser magnitude of a force to cause its disassembly

Answer 11

Non-rigid body

Question 12

It is exerted by one body on another via “push or pull”

Answer 12

Force/s

Question 13

It is evident in interactions between bodies (pushing on a wall)

Answer 13

Force/s

Question 14

TRUE or FALSE
Forces can occur through a distance when bodies are physically separated. For example/s: gravity, electricity, magnetism

Answer 14

True

Question 15

True or False
A force is completely characterized by its magnitude, direction, and point of application

Answer 15

True.
Force is a vector quantity

Question 16

True or False
Force could or could not cause a change in the state of motion of a body.

Answer 16

True.
In accordance with Newton’s 2nd law of Motion.

Question 17

It is the one that causes a body to be stressed, stressed-out, deformed, and eventually lead into failure via the so called “stress”

Answer 17

Force/s

Question 18

What are the classification of force? (2)

Answer 18

Applied or Non-applied forces

Question 19

What is the most common type of force?

Answer 19

Gravitational force, resulting in what we call WEIGHT

Question 20

What is the Principle of Transmissibility?

Answer 20

States that a force acting on a body can be applied anywhere along the force’s line of action without changing its effect on the body.

Question 21

It is any positive or negative physical quantity that can be completely specified by its magnitude

Answer 21

Scalar

Question 22

It is any physical quantity that requires both a magnitude and a direction for its complete description

Answer 22

Vector

Question 23

It is a very real and noticeable force applied directly to an object

Answer 23

Applied force

Question 24

It is a very real and noticeable force applied directly to an object

Answer 24

Applied force

Question 25

It is a force that may not be as readily apparent or recognizable. Ex: gravitational force or simply weight

Answer 25

Non-applied Force

Question 26

These are forces besides the gravitational force that are applied externally to a given body, object, or structure.

Answer 26

External force

Question 27

It is the reason for the movement/non-movement, build-up of stress, deformation, or eventually failure.

Answer 27

External force

Question 28

Also known as "Reactive force" this as a result of the application external forces

Answer 28

Internal force

Question 29

This force will not exist without the application of external force

Answer 29

Internal force

Question 30

Individual isolation in a free-body diagram is possible using what method?

Answer 30

Method of members

Question 31

is any arrangement in space where there are two or more forces acting on a body or group of related bodies.

Answer 31

Force system

Question 32

What are the 10 classifications of force systems?

Answer 32

1. Coplanar 2. Non-coplanar 3. Coplanar-collinear 4.Coplanar-concurrent 5. Non-coplanar, concurrent 6. Non-coplanar, non-concurrent 7. Coplanar, Parallel 8. Non-coplanar, parallel 9. Non-coplanar, non-parallel 10. Force Couple system

Question 33

is a force system whose lines of action lie in one plane

Answer 33

Coplanar force system

Question 34

is a force system whose lines of action is in more than one plane

Answer 34

non-coplanar force system

Question 35

when the lines of action of all the forces of a system act along the same line and at the same plane

Answer 35

Coplanar-collinear force system

Question 36

forces in a system whose lines of action pass through a common point at a common plane, 2-dimensional

Answer 36

Coplanar-concurrent force system

Question 37

one whose lines of action are neither parallel nor intersect a common point at a common plane, 3-dimensional

Answer 37

Non-coplanar, concurrent force system

Question 38

one whose lines of action are neither parallel nor intersect a common point at a common plane, 3D view

Answer 38

Non-coplanar, non-concurrent force system

Question 39

a force system having the lines of action of its forces acting parallel with one another and in the same plane, 2D view

Answer 39

Coplanar, parallel force system

Question 40

a force system having the lines of action of its forces acting parallel with one another but does not lie on the same plane, 3D view

Answer 40

Non-coplanar, parallel force system

Question 41

a force system having the lines of action of its forces acting non-parallel with one another and also does not lie on the same plane, 3D view

Answer 41

non-coplanar, non-parallel force system

Question 42

a force system consisting of a pair of equal coplanar, oppositely directed parallel forces but are not collinear, 2D view

Answer 42

force couple system

Question 43

It is a simplified illustration of the figure (structure) in question, where the actual figure maybe represented by a simple line "FREED" from its supports

Answer 43

Free-body diagram (FBD)

Question 44

This only shows the action of forces such as applied forces (push/pull), non-applied (gravitational weight), and reaction forces (from supports)

Answer 44

Free-body diagram (FBD)

Question 45

TRUE OR FALSE the weight of an object is always located at the object's "center of gravity"

Answer 45

TRUE

Question 46

These are forms of supports belonging to the same kind and are always subjected to the force of "TENSION"

Answer 46

cables, wires, strings, and rope

Question 47

TRUE OR FALSE tension is always opposite the direction of object/part it is supporting

Answer 47

True

Question 48

True or False If an object is supported by one of the said supports, the tension value is less than to the object's weight

Answer 48

False. Tension value is EQUIVALENT (=) to the object's weight

Question 49

it is a form of support that is used to prevent the free-fall of an object placed onto it

Answer 49

Plane surface

Question 50

a form of support that is used to provide linear mobility to an object or assembly

Answer 50

rollers

Question 51

a form of support that is used to provide rotational mobility to an object or assembly by serving as an object's/assembly's pivot (point of rotation)

Answer 51

hinges/pins