LESSON 1: (PART 1-4)

Question 1

is the branch of physics that considers the action of forces on bodies or fluids that are both at rest and in motion.

Answer 1

Mechanics

Question 2

branch of engineering that applies the principles of mechanics to any design that must take into account the effect of forces.

Answer 2

Engineering Mechanics

Question 3

The study of the internal effects of external forces applied to structural member. it includes stress, strain, deformation deflection, torsion, flexure, shear diagram, and moment diagram.

Answer 3

Strength of Materials or Mechanics of deformable bodies

Question 4

FOUR DIFFERENT TYPES OF RESULTANT LOADINGS

Answer 4

1. Normal Forces (F)
2. Shear forces (V)
3. torsional moment or torque (T)
4. bending moment (M)

Question 5

this force acts perpendicular to the area. it is developed whenever the external loads tend to push or pull on the two segments of the body

Answer 5

Normal Forces

Question 6

it lies in the plane of the area and it develop when the external loads tend to cause the two segments of the body to slide over one another.

Answer 6

Shear force

Question 7

this effect is developed when the external loads tent to twist one segment of the body with respect to the other about an axis perpendicular to the area.

Answer 7

Torsional moment or
Torque

Question 8

it is cause by the external loads that tend to bend the body about an axis lying within the plane of the area.

Answer 8

Bending Moment

Question 9

it is defined as the strength of a material per unit area of unit strength. it is the force on a member divided by area.

Answer 9

Simple stress

Question 10

3 types of Simple stress

Answer 10

1. Normal stress
2. Shear stress
3. Bearing stress

Question 11

this stress is either tensile stress or compressive stress.

Answer 11

Normal stress

Question 12

members subject to pure tension (or tensile forces) is under _________. while compression members (compressive force) are under ___________.

Answer 12

Tensile stress, Compressive stress

Question 13

compressivoe force will tend to ________ the member. Tension force on the other hand will ten to ______________.

Answer 13

shorten and lengthen

Question 14

Forces parallel to the area resisting the force cause _________.

Answer 14

Shearing stress

Question 15

Shearing stress is also known as?

Answer 15

tangential stress

Question 16

3 types of shear

Answer 16

1. single shear (T= V/A)
2. double shear (T= V/2A)
3. punch (T= V/pi(dt))

Question 17

It is the contact pressure between the separate bodies.

Answer 17

Bearing stress

Question 18

formula of simple stress

Answer 18

simple stress= P/A

Question 19

Formula of Shear stress?

Answer 19

T= P/A

Question 20

Bearing stress formula

Answer 20

Sb= Pb/dt

Question 21

one method of specifying the allowable load for a member is to use a number called the ___________.

Answer 21

Factor of Safety (F.S.)

Question 22

it is a ratio of the failure load to the allowable load.

Answer 22

Factor of safety

Question 23

formula of F.S.

Answer 23

F.S.= F(fail)/F(allow)

Question 24

F.S. must be _____________ 1.0 in order to avoid the potential for failure.

Answer 24

greater than

Question 25

A tank or pipe carrying a fluid or gas under a pressure is subjected to tensile forces, which resist bursting, developed across longitudinal and traverse sections.

Answer 25

Thin-walled pressure vessels

Question 26

which more critical, tangential stress or longitudinal stress?

Answer 26

Tangential stress

Question 26

what is the other term for tangential stress?

Answer 26

circumferential stress, hoop stress, and radial stress

Question 26

Tangential stress formula

Answer 26

σt= pD/2t

Question 26

what is the formula of tangential stress if there is an existing extend pressure (p0) and an internal pressure (pi)?

Answer 26

σt= ((pi-p0)D)/ 2t

Question 27

formula of longitudinal stress

Answer 27

σL= pD/4t