Engineering Mechanics 101-150 Flashcards
(50 cards)
1
Q
- It is defined as, regardless of the force acting on a fluid, the fluid continues to flow.
A
Newtonian fluid
2
Q
- Which of the following is an example of Newtonian fluid?
Oobleck;Puddong;Water;Paint
A
Water
3
Q
- If an object is stationary or moving at a constant velocity, then
No force are acting on the object; The force acting the object are balance; The object is in equilibrium
A
Either of the above
4
Q
- It is an additional force that exactly balances a resultant force.
Reactant; Equilibrant; Bouyant; Reverse effective force
A
Equilibrant
5
Q
- It is point within an object from which the force of gravity appears to act
Center of gravity; centriod; Center of mass
A
All of the above
6
Q
- If an area has one line of symmtery the centroid will
A
Lie somewhere along the line symmtery
7
Q
- The second moment of area is an important value which is used to______. It can also be called moment of inertia.
Determine the state of stress in a section; Calculate the resistance to buckling; determine the amount of deflection in a beam
A
All of the above
8
Q
- The _____ transfers the moemnt of inertia of a section or area from its own centroidal axis to another parallel axis.
A
Transfer formul or Parallel axis theorem
9
Q
- The moment of force is zero when.
The applied force is zero; the force is applied at the moemnt axis; the line of action of the force is parallel to the moment axis
A
all of the above
10
Q
- The mass moment of inertia of a solid sphere about is diameter is.
A
2/5 mr^2
11
Q
- The mass moment of inertia of a thin spherical shell about its diameter is.
A
2/3 mr^2
12
Q
- It is a mathematical property of a section concerned with a surface area and how that area is distributed about the reference axis.
A
Second moment of area
13
Q
- It is the material’s ability to resist twisting
A
Polar moment of area
14
Q
- “Any objcet, wholly or partly immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object” This is known as the
‘
A
Archimedes Principle
15
Q
- It is the upward force on an object produced by the surrounding fluid in which it is fully or partially immersed.
A
Buoyancy
16
Q
- If the buoyancy of an object exceeds its weight, the object
A
Tends to rise
17
Q
- It is the rate of change of velocity
A
Acceleration
18
Q
- Impulse is equal to
A
Force x Time or Change in momentum
19
Q
- Collisions in which object rebound with the same speed as they had prior to the collision are known as
A
Elastic collisions
20
Q
- It is defined as the integral of force with respect to time.
A
Impulse
21
Q
- The SI unit for angular velocity is
A
Radians per second
22
Q
- The angular momentum of a rotating object can be calculated by the formula.
A
Mass moment of inertia x angular velocity
23
Q
- The time derivative of angular momentum is called?
A
Torque
24
Q
- It defines limits on how accurately the momentum and position of a single observable system can be known at once.
A
Heisenberg uncertianty principle
25
125. The SI unit for polar moment of inertia is
m^4
26
126. A structure is ________ when the static equilibrium equations are not sufficient for determining the internal forces and reactions on that structure.
Statically determinate
27
127. It is an equation used to find the final velocity of an object moving with a constant acceleration without having a known time interval.
Torricelli's equation
28
128. Torricelli's equation of motion is
Vf^2 = Vi^2 + 2as
29
129. Which of the following is true about centripetal force?
It is directed toward the center of the circular path
30
130. Centripetal acceleration
Changes the direction of the velocity
31
131. Tangential acceleration
Changes the magnitude of the velocity
32
132. The _____ is the primary force from which gravity, electromagnetic and electrostatic manifest.
Gforce
33
133. The value of Gforce is equal to
1.211x10^44
34
134. The gravitational force constant has the units
m^3 kg ^-1 s^-2
35
135. Its is the resistance that occurs when a round object such as a ball or a tire rolls on a flat surface
Rolling resistance; Rolling friction; Rolling drag
Either of the above
36
136 Which of the following affects the magnitude of rolling resistance an object generates?
Type of material; dimension
None of the above
37
137. Rolling resistance coefficient is a dimensionless quantity also known as
coefficient of rolling friction
38
138. The rolling resistance coefficient of fall raod steel wheel on steel rail is
0.0002-0.0010
39
139. The rolling resistance coefficient of ordinary car tires on concrete is
0.01-0.015
40
140. It is the factor by which a mechanism multiplies the force pur into it.
Mechanical advantage
41
141. It is the study that describes the motion of macroscopic objects.
Classical mechanics
42
142. It is the science which deals with bodies in motion or at rest with specific attention being directed primarily to the external effects of a force or a system.
mechanics
43
143. Delas with the conditions of equilibrium of rigid bodies acted upon by a balance systems of forces.
Statics
44
144. Deals with bodies being acted upon by an unbalanced system of forces the resultant of which causes the body to be accelerated.
Dynamics
45
145. Deals with the geometry of motion
Kinematics
46
147. A specific amount of matter all particles of which reamin at fixed distance is each other.
Rigid Body
47
148. Results when a body is acted upon by the force.
deformation
48
149. A fixed body property which determines its resistance to change in motion
Mass
49
150. The action of one body on another body which changes or tends to change the motion of the body acted on.
Force
50
146. Deals with the forces required to produced motion
kinetics
