Engineering Mechanics 1-50 Flashcards
What is the branch of engineering mechanics which refers to the study of stationary rigid body?
Statics
What is the branch of engineering mechanics which refers to the study of rigid body in motion under the action of forces?
Dynamics
What is the branch of engineering mechanics which refers to the study of rigid body in motion without reference of the force that causes the motion?
Kinematics
What refers to the force that holds part of the rigid body together?
Internal force
What refers to a pair of equal, opposite and parallel forces?
Couple
What is a concurrent force system?
All forces act at the same point.
When will a three-force member be considered in equilibrium?
When they are concurrent or paralle
A roller support has how many reaction
1
A link or cable support has how many reaction?
1
Which support has one moment?
Fixed support
What is the science that describes and predicts the effect on bodies at rest or in motion by forces acting on it?
Engineering mechanics
What refers to a negligible body when compared to the distances involved
Particle
The resulting force of a distributed load is always acting at:
The centroid of the are of the loading curve
The resultang force of a distributed load is always equal to:
A the area under the loading curve
When a body has more supports than are necessar to maintain equilibrium, the body is said to be
in
static equilibrium
When does an equation be considered “dimensionally homogeneous”?
When the dimensions of various terms on the left side of the equation is the same as the dimensions of the various terms on the right side.
What refers to the branch of mathematics which deals with the dimensions of quantities
Dimensional analysis
What is a “Simple beam”?
A beam supported only at its
What assumption is used in the analysis of uniform flexible cable?
Cable is flexible; Cable is inextensible; The qeight of the cable is very small when compared to the loads supported by the cable
“The sum of individual moments about a point caused by multiple concurrent forces is equal to the moment of the resultant force about the same point”. This statement is known as
Varignon’s Theorem
“Two forces acting on a particle may be replaced by a single force called resultant which can be obtained by drawing diagonal of parallelogram, which has the sides equal to the given forces”. This statement is known
Parallelogram Law
“The condition of equilibrium or motion of a rigid body remains unchanged if a force acting at a given point of the rigid body is replaced by a force of same magnitude and direction, but acting at a different point provided that the two forces have the same line of action” This statement is known as
Principle of Transmissbility
“if two forces acting simultaneously on a particle can be repsented by the two sides of a triangle taken in order that the third side represents the resultant in the opposite order”. This statement is known as
Triangle Law of Forces
“If a number of concurrent forces acting simultaneously on a particle, are represented in magnitude and direction by the sides of polugon taken in order, then the resultant of this system of forces is represented by the closing side of the polygon in the opposite order”.This statement is known as
Polygon law
A beam with more than one supports is called
Continuous beam
A truss consisting of coplanar members is called
Plane truss
What method of determining the bar force of a truss if only few members are required?
Method of section
Which of the following statement about friction is FALSE?
The direction of frictional force on a surface is such as to oppose the tendency of one surface to slide to the order.
The total frictional force is dependent on the area of contant between the two surfaces.
The mag nitude of the frictional force is equal to the force which tend to move the body till the limiting value is reached.
Friction force is always less than force required to prevent motion.
The total frictional force is dependent on the area of constant between the two surfaces.
In the analysis of friction, the angle between the normal force and the resultant force ______ the angle of friction.
Is less than
When a block is place on an inclined plane, its steepest inclination to which the block will be in equilibrium is called?
Angle of repose
What is usually used to move heavy loads by applying a force which is usually smaller that the weight of the load?
Wedge
The angle of inclined plane of a jack screw is also known as
Angle of lead
Center of gravity for a two dimensional body is the pount at which the entire ______ acts regardless of the orientation of the body.
Weight
Second moment of area is the product of:
Are and square of the distance from
the reference axis
Moment of inertia of an area about an axis is equal to the sum of moment of inertia about an axis passing through the centroid parallel to the given axis and
Area and square of the distance between two parallel axes
What is the unit of mass moment of inertia?
kg-m^2
The number of independent degrees of freedom is:
Total degrees of freedom-number of constrain equations
When a force causes a change in mechanical energy when it moves around a closed path, it is said to be ________ force.
non-conservative
The following set of quantities that describe motion and uses the principle of work and energy?
Force, mass, distance, velocity
Which of the following set of quantities that describe motion and uses the principle of impulse and momentum?
Force, mass, distance, Velocity, time
The principles of kinetics of particles are derived from which law?
Newton’s second law
What type of impact is when the motion of one or both of the colliding bodies is not directed along the line impact?
Oblique impact
What type of impact is when the centers of mass of colliding bodies are note located on the line of impact?
Eccentric impact
If the coefficient of restitution is zero, the impact is
perfectly inelastic
If the coefficient of restitution is zero, the impact is
perfectly inelastic
A uniform circular motion canbe considered as a combination of
two simple harmonic motions
