Introduction to Strength of Materials

Question 1

Three fundamental areas of engineering mechanics

Answer 1

statics, dynamics, and the strength of materials

Question 2

devoted primarily to
studying the external effects of forces on rigid bodies.

Answer 2

Statics and dynamics

Question 3

is an idealization of a body that does
not deform or change shape.

Answer 3

Rigid Body

Question 4

deals with the relations
between externally applied loads and their internal
effects on bodies.

Answer 4

Strength of materials

Question 5

If the resultant is zero,

Answer 5

static
equilibrium.

Question 6

If the resultant is not zero,

Answer 6

may apply inertia
forces to bring about dynamic equilibrium.

Question 7

reference points

Answer 7

x,y&z

Question 8

the origin of the reference axis is at the centroid

Answer 8

o

Question 9

coincide with the principles axis of inertia

Answer 9

y,z

Question 10

axis is normal to the section

Answer 10

x

Question 11

axial force, measure the pulling or pushing action
on the section, denoted by P

Answer 11

Pxx

Question 12

a tensile force tends to elongate the member

Answer 12

Pull

Question 13

a compressive force tends to shorten the
member

Answer 13

Push

Question 14

shear force, measures sliding action of the
portion to one side of the section past the other.

Answer 14

Pxy , Pxz

Question 15

measures the resistance to twisting the
member, denoted by M

Answer 15

Mxx, Torque

Question 16

Bending moment

Answer 16

Mxy , Mxz

Question 17

Measures the resistance to bending the
member about y-axis

Answer 17

Mxy or My

Question 18

Measures the resistance to bending the member about z-axis

Answer 18

Mxz or Mz