Engineering Mechanics 101-150 Flashcards
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
Q
- The SI unit for polar moment of inertia is
A
m^4
26
Q
- A structure is ________ when the static equilibrium equations are not sufficient for determining the internal forces and reactions on that structure.
A
Statically determinate
27
Q
- It is an equation used to find the final velocity of an object moving with a constant acceleration without having a known time interval.
A
Torricelli’s equation
28
Q
- Torricelli’s equation of motion is
A
Vf^2 = Vi^2 + 2as
29
Q
- Which of the following is true about centripetal force?
A
It is directed toward the center of the circular path
30
Q
- Centripetal acceleration
A
Changes the direction of the velocity
31
Q
- Tangential acceleration
A
Changes the magnitude of the velocity
32
Q
- The _____ is the primary force from which gravity, electromagnetic and electrostatic manifest.
A
Gforce
33
Q
- The value of Gforce is equal to
A
1.211x10^44
34
Q
- The gravitational force constant has the units
A
m^3 kg ^-1 s^-2
35
Q
- 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
A
Either of the above
36
Q
136 Which of the following affects the magnitude of rolling resistance an object generates?
Type of material; dimension
A
None of the above
37
Q
- Rolling resistance coefficient is a dimensionless quantity also known as
A
coefficient of rolling friction
38
Q
- The rolling resistance coefficient of fall raod steel wheel on steel rail is
A
0.0002-0.0010
39
Q
- The rolling resistance coefficient of ordinary car tires on concrete is
A
0.01-0.015
40
Q
- It is the factor by which a mechanism multiplies the force pur into it.
A
Mechanical advantage
41
Q
- It is the study that describes the motion of macroscopic objects.
A
Classical mechanics
42
Q
- 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.
A
mechanics
43
Q
- Delas with the conditions of equilibrium of rigid bodies acted upon by a balance systems of forces.
A
Statics
44
Q
- Deals with bodies being acted upon by an unbalanced system of forces the resultant of which causes the body to be accelerated.
A
Dynamics
45
Q
- Deals with the geometry of motion
A
Kinematics
46
Q
- A specific amount of matter all particles of which reamin at fixed distance is each other.
A
Rigid Body
47
Q
- Results when a body is acted upon by the force.
A
deformation
48
Q
- A fixed body property which determines its resistance to change in motion
A
Mass
49
Q
- The action of one body on another body which changes or tends to change the motion of the body acted on.
A
Force
50
Q
- Deals with the forces required to produced motion
A
kinetics
