Mechanics of Rigid Bodies Flashcards
Ratio of the sliding force required to the weight of the material being pushed. It is the measure of the resistance to the sliding of one material resting on another.
a. Sliding Coefficient
b. Coefficient of retribution
c. Factor of Safety
d. Coefficient of Friction
d. Coefficient of Friction
For a force system to be in static equilibrium, the algebraic summation of forces is:
a. 100%
b. minimum
c. maximum
d. zero
d. zero
Two forces equal in magnitude but oppositely directed and produce moment is called
a. Torque
b. Moment
c. Couple
d. Coupling
c. Couple
“A force may be moved anywhere along its line of action without producing a change in external effect.” This statement is ___.
a. True
b. False
a. True
What states the “moment of the resultant of 2 concurrent forces about any axis perpendicular to the plan of forces is equal to the algebraic sum of the moments of the 2 forces about the same axis”?
a. Hooke’s Law
b. Pythagorean Theorem
c. Varignon’s Theorem
d. Betti’s Law
c. Varignon’s Theorem
In a structure whose material follows Hooke’s Law and in which the supports are unyielding and the temperature is constant, what law states that the external virtual work done by a system of forces, P, during the deformation caused by a system of forces, Q, is equal to the virtual work done by a system of forces, Q, during the deformation caused by the P forces?
a. Hooke’s Law
b. Pythagorean Theorem
c. Varignon’s Theorem
d. Betti’s Law
d. Betti’s Law
Snow loads, wind, pressure suction and earthquake loads and the like are what type of loads?
a. Dead Loads
b. Live Loads
c. Seismic Loads
d. Environmental loads
d. Environmental loads
This states that the external effect of a force on a body is the same for all points of application along its line of action; i.e., it is independent of the point of application.
a. Principle of Compatibility
b. Principle of Transmissibility of a force
c. Principle of Action and Reaction
d. Principle of Moments
b. Principle of Transmissibility of a force
Among the following axioms of mechanics, which of the following is INCORRECT?
a. The parallelogram law: The resultant of two forces is the diagonal of the parallelogram formed on the vectors of these forces.
b. The forces are in equilibrium only when equal in magnitude, opposite in direction, and collinear in action.
c. A set forces in equilibrium may be added to any system of forces thus changing the effect of the original system.
d. Action and reaction forces are equal but oppositely directed.
c. A set forces in equilibrium may be added to any system of forces thus changing the effect of the original system.
An elevator cable will have its greatest tension when the elevator car is moving ___.
a. downward but coming to rest
b. upward at a constant speed
c. upward but coming to rest
d. downward at a constant speed
a. downward but coming to rest
These are referred to permanent of loads or unmovable loads.
a. Dead Loads
b. Live Loads
c. Seismic Loads
d. Environmental loads
a. Dead Loads
It is a type of truss having both vertical and diagonal members between the upper and lower chords, with the diagonals sloping toward the centre.
a. Fink Truss
b. Pratt Truss
c. Arch Truss
d. Warren Truss
b. Pratt Truss
It states that stress is proportional to strain.
a. Pascal’s law
b. Law of Gravity
c. Hooke’s Law
d. Varignon’s Theorem
c. Hooke’s Law
The normal force exerted by a smooth horizontal surface towards a 100-lb block acting on it is
a. 100 lbs
b. zero
c. 50 lbs
d. 200 lbs
a. 100 lbs
It refers to occupancy load which is either partially or fully in place or may not be present at all is called:
a. Dead Loads
b. Live Loads
c. Seismic Loads
d. Environmental loads
b. Live Loads
