WorksheetsSA2 Mechanics & Strength of Materials
Total questions: 72
Worksheet time: 36mins
Study of motion with reference to the force which causes the motion is
Statics
Kinetics
Dynamics
Kinematics
An impulse causes
The object's momentum to change
The object's momentum to increase
The object's momentum to decrease
The object's momentum to remain constant or be conserved
Momentum is a property related to the objects ________.
Motion and mass
Motion and velocity
Mass and acceleration
Weight and velocity
Centrifugal force is________.
Directly proportional to the radius of the curvature
Directly proportional to the square of the weight of the object
A measure of the resistance of a body it offers to any change in its angular velocity, determined by the mass and distribution of its mass about the axis of rotation is known as
Moment of inertia
Friction
Torsion
Angular Acceleration
Momentum is the product of mass and
Acceleration
Force
Velocity
Time
The moment of inertia of a plane figure, ____.
Increases as distance of the axis moves farther from the centroid
Is zero at the centroidal axis
is maximum at the centroidal axis
Decreases as the distance of the axis moves farther from centroid
To maximize the horizontal range of the projectile, which of the following applies?
Maximize Velocity
Minimize the angle of elevation
Maximize the angle of elevation
The tangent function of the angle and velocity of trajectory must be equal to 1
Moment of inertia of any plane figure is expressed in units of length of the
First power
Third power
Second power
Fourth power
A branch of physical science which deals with state of rest or motion of bodies under the action of forces
Mechanics
Kinematics
Statics
A branch of mechanics which deals with bodies at rest.
Statics
Kinetics
Dynamics
Kinematics
Branch of mechanics which deals with bodies in motion
Statics
Kinetics
Dynamics
Kinematics
The action of a force is characterized by
Its magnitude
Point of application
The direction of its action
All of these
For the system to be equilibrium,
The force polygon must close
It must satisfy the 3 statics equations
All forces must be concurrent, if not acting parallel
All of these
A pair of forces equal in the magnitude, opposite in direction, and not in the same line is called
Moment
Couple
Torque
All of these
The ______ exerted by a force on a body is the measure of its effectiveness in turning the body about a certain pivot
Couple
Moment arm
Torque
All of these
A body is said to be in "rotational equilibrium" when
No net torque acts on it
Its vector sum of the forces is zero
No net force acts on it
The forces acting on the body are non-concurrent
A couple consists of two forces, _____ in magnitude, parallel and opposite directed.
Directly Proportional
Unequal
Equal
Inversely Proportional
The _______ of the body or system is the point about with the product of the mass and the moment arm sums up to zero
Center of gravity
Centroid
Center of mass
All of the above
The point through which the resultant of the distributed gravity force passes regardless of the orientation of the body is space
Center of inertia
Center point
Center of mass
Center of gravity
If an object exerts a normal force on a surface, then its normal force is
Equal to the weight of the object
Parallel to the surface
Parallel to the surface
Perpendicular to the surface
Whenever the surfaces of two bodies are in contact. There will be a limiting amount of resistance to sliding bet them. This is known as
Friction
Angle of friction
Coefficient of friction
Coefficient of sliding
The moment of inertia of a triangle with respect to the base b is
bh3 /12
bh3 /36
bh3 /6
bh3 /3
The moment of inertia f a triangle with respect to the base is ______ time is moment of inertia with respect to its centroidal axis?
2
3
4
5
What is the moment of inertia of a circle
π 4 /16
π 4 /24
π 4 /2
π 4 /4
The moment of inertia of the circle with respect to its tangent is________ times its centroidal moment of inertia.
2
3
4
5
The moment of inertia of rectangle with respect to be the base is ______ times its moment of inertia with respect to the centroid
2
3
4
5
What is the mass moment of inertia of a sphere of mass m and radius r?
1/2 mr2
1/3 mr2
1/4 mr2
2/5 mr2
Given a cylinder of radius r, altitude h and mass m. what is its mass of inertia?
1/2 mr2
1/3 mr2
1/4 mr2
2/5 mr2
A structure is called ______ if at least one of its individual members is a multi-force member.
Truss
Three-hinged arch
Frame
Bridge
Another term of moment of inertia.
Moment of area
Moment of mass
Second moment of area
All of the above
The diagram of an isolated body with the representation of all external forces acting on it is called
Maxwell diagram
Free body diagram
Stress-strain diagram
Shear and moment diagram
A framework composed of members joined at their ends to form a rigid structure
Machine
Joist
Truss
Purlin
The moment of the resultant of two concurrent forces with respect to a center of their planes is equal to the algebraic sum of the moments of the components with respect to the same center,
Law of reaction
Mass moment of inertia
Varignon's theorem
Law of inertia
The condition exist I structures where the reactive forces exceed the number of independent equations for equilibrium. Such case is called
Statically determine
Static equilibrium
Statically indeterminate
None of the above
Two lengths of a steel wire are used to support a chandelier of weight a. The tension in the wire must
Each be W/2
Have a vector sum of magnitude w
Each be W
Have a vector sum of magnitude > w
The built-in or fixed support is capable of supporting
An axial load
A bending moment
A transverse load
All of these
Which of the following BEST describes d'Alembert's principle?
F=ma
Stress is directly proportional to strain
First law of motion
F=kx
The theorem which is closely related to d'Alembert's theorem is the
Newton's first law of motion
Newton's second law of motion
Newton's third law of motion
Bernoulli's motion
_________ is the quality of being plastically elongated
Flexible
Malleability
Plasticity
Ductility
It is the ratio og the ultimate stress to the allowable stress.
Proportionality constant
Factor of safety
Strain
Modulus
The greatest unit pressure the soil can continuously stand is called
Bearing strength
Ultimate strength
Yield strength
Fatigue strength
The distance that the top surface is displaced in the direction of the force divided by the thickness of the body is known as
Longitudinal strain
Shear strain
Linear strain
Volume strain
The ratio of the tensile stress to tensile strain
Shear modulus
Bulk modulus
Modulus of elasticity
Hooke's law
Another term of modulus elasticity
Bulk modulus
Young's modulus
Shear modulus
Moment of inertia
What is the value of the modulus of elasticity of steel?
200 Gpa
150 Mpa
200 Mpa
150Gpa
The slope of the stress-strain diagram in the linearly elastic region is called
Yield strength
Elastic limit
Proportional limit
Modulus of elasticity
The modulus of elasticity in shear is commonly called as
Modulus of rigidity
Bulk modulus
Young's modulus
Deformation
A kind of stress caused by forces acting along a parallel to the area resisting the forces.
Tangential
Shearing stress
Compressive mass
Tensile stress
A kind of stress caused by forces acting perpendicular to the area resisting the forces.
Tangential stress
Diagonal stress
Shearing stress
Bearing stress
Refers to the highest ordinate on the stress-strain diagram.
Rapture strength
Yield strength
Ultimate strength
Allowable strength
At highest or lowest point on the moment diagram
Shear is maximum
Shear is half the maximum moment
Shear is zero
Shear is negative
For symmetrically loaded simple bam the maximum shear occurs at
The midspan
1/3 from the support
The support
1/4 the suppor
For symmetrically loaded simple beam, the maximum moment occurs at
The midspan
1/3 from the support
The support
1/4 from the support
Poisson ratio is
The ratio of the stress to strain
The other term for factor of safety
The other term for slenderness ratio
The ratio of the unit lateral deformation to the unit longitudinal deformation*
Which of the following is NOT a method of determining the bar force of a truss member.
Method of joints
Method of virtual work
Method of section
Maxwell diagram
The actual stress the material has when under load.
Allowable stress
Working stress
Ultimate stress
Factor of safety
The ratio of the volume stress to the volume strain is called
Young's modulus
Bulk modulus
Shear modulus
Hooke's law
A kind of stress that is caused by forces acting along or parallel to the area resisting the force.
Tensile stress
Shearing stress
Bearing stress
Tangential stress
Stress is proportional to strain. The constant of proportionality is called as young's modulus. Who introduced this 1807?
Sean young
James young
Neil young
Thomas young
Obtained by dividing the differential load dP by the differential area dA over which it acts
Stress
Elongation
Strain
Elasticity
What is the SI unit for stress?
Pascal
Psi
Joules
Kg/cm2
Unit strain is
Inversely proportional to the unit stress
Unit less
Expressed in Pascal's
Directly proportional to the length of the object
The ratio of unit deformation or strains in a transverse direction is constant for stresses within the proportional limit. This is known as
Hooke's Law
Poisson Ratio
Mohr's Circle
Slenderness Ratio
The stress beyond which the material will not return to its original shape when unloaded but will retain a permanent deformation
Proportional limit
Yield limit
Elastic limit
Yield strength
A simple beam carrying a uniform load of w throughout its entire length L has maximum moment of
wL/2
wL2 /4
wL2 /2
wL2 /8
The moment of inertia of a rectangular whose base is B and height H, about its base is
bh3 /12
bh3 /3
bh3 /4
bh3 /36
In general design, stress and factor of safety are related as follows:
Design stress = ultimate stress x factor of safety
Design stress = ultimate stress/factor of safety
Factor of safety = Design stress/ultimate stress
Ultimate stress = Factor of safety/Design stress
The dimension of "Acceleration x Mass" is the same as that to
Power
Work
Length
Weight
Galvanized iron is a term referring to iron coated with
Aluminum
Tin
Magnesium
Zinc
In a cantilever beam with a concentrated load at the free end, the moment is
Maximum at the wall
Constant along the beam
1/4 Maximum half way out on the beam
Maximum at the free end
The coefficient of friction for dry surfaces
Depends on the composition of the materials only
Depends only on the finish condition of the surface
Depends on the materials and the finish condition of the surfaces
Does not depend on the material
