Mehcanics & Strength of Materials

kinetics

Study of motion with reference to the force which causes the motion is

the object's momentum to change

An impulse causes

motion and mass

Momentum is a property related to the objects

directly proportional to the square of the tangential velocity

Centrifugal force is

angular acceleration

A measure of the resistance of a body it offers to anyany change in its angular velocity, determined by the mass and aistribution cf its mass about the axis of rotation is known as

velocity

Momentum is the product of mass and

increases as distance of the axis moves farther from the centroid

The moment of inertia of a plane figure,

The tangent function of the angle and velocity of trajectory must be equal to 1

To maximize the horizontal range of the projectile, which of the bllowing applies?

fourth power

Moment of inertia of any plane figure is expressed in units of length of the

Mechanics

A branch of physical science which deals with state of rest or motion of bodies under the action of forces.

Statics

A branch of mechanics which deals with bodies at rest

Dynamics

Branch of mechanics which deals with bodies in motion.

The action of a force is characterized by

all of the above

For a system to be in equilibrium,

all of the above

couple

A pair of forces equal in magnitude, opposite in direction, and not in the same line is called

torque

The ____ exerted by a force on a body is the measure of its effectiveness in turning the body about a certain pivot.

по пet torque acts on it

A body is said to be in "rotational equilibrium" when

equal

A couple consists of two forces, ____ in magnitude, parallel and oppositely directed.

center of mass

The _____ of the body or system is the point about with the product of the mass and moment arm sums up to zero.

Center of gravity

The point through which the resultant of the distributed gravity force passes regardless of the orientation of the body is space.

perpendicular to the surface

If an object exerts a normal force on a surface, then its normal force is

friction

Whenever the surfaces of two bodies are in contact, there will be a limiting amount of resistance to sliding between them. This is known as

bh³/12

The moment of inertia of a triangle with respect to the base b is

3

The moment of inertia f a triangle with respect to the base is ____ time its moment of inertia with respect to its centroidal axis?

πr⁴/4

What is the moment of inertia of a circle of

5

The moment of inertia of the circle with respect to its tangent is ____ times its centroidal moment of inertia.

4

The moment of inertia of a rectangle with respect to the base is ___ times its moment of inertia with respect to the centroid.

2/5 mr²

What is the mass moment of inertia of a sphere of mass m and radius r?

½ mr²

Given a cylinder of radius r, altitude h and mass m. What is its mass of inertia?

frame

Astructure is called ____ if at least one of its individual members is amultiforce member.

Second moment of area

Another term of moment of inertia.

free body diagram

The diagram of an isolated body with the representation of all external forces acting on it is called

Truss

A framework composed of members joined at their ends to form rigid structure.

Varignon's theorem

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

statically indeterminate

The condition exist if structures where the reactive forces exceed the number of independent equations for equilibrium. Such case is called

have a vector sum of magnitude W

Two lengths of a steel wire are used to support a chandelier if weight A. The tension in the wire must

The built-in or fixed support is capable of supporting

all of the above

Which of the following BEST describes d'Alembert's principle?

F= ma

Plasticity

is the quality of being plastically elongated.

Newton's second law of motion

The theorem which is closely related to d'Alembert's theorem is the

Factor of safety

It is the ratio of the ultimate stress to the allowable stress.

bearing strength

The greatest unit pressure the soil can continuously stand is called

shear strain

The distance that the top surface is displaced in the direction of the force divided by the thickness of the body is known as

Modulus of elasticity

The ratio of the tensile stress to tensile strain.

Young's modulus

Another term for modulus of elasticity.

200 GPa

What is the value of the modulus of elasticity of steel?

modulus of elasticity

The slope of the stress-strain diagram in the linearly elastic region is called

modulus of rigidity

The modulus of elasticity in shear is commonly called as

Shearing stress

A kind of stress caused by forces acting along a parallel to the area resisting the forces.

Bearing stress

A kind of stress caused by forces acting perpendicular to the area resisting the forces.

Ultimate strength

Refers to the highest ordinate on the stress-strain diagram.

shear is zero

At highest or lowest point on the moment diagram.

the support

For symmetrically loaded simple bam the maximum shear occurs at

the midspan

For symmetrical loaded simple beam, the maximum moment occurs at

the ratio of the unit lateral deformation to the unit longitudinal deformation

Poisson ratio is

Working stress

The actual stress the material ahs when under load.

Which of the following is NOT a method of determining the bar force of a truss member.

Maxwell diagram

Bulk modulus

The ratio of the volume stress to the volume strain is called

Shearing stress

A kind of stress that is caused by forces acting along or parallel to the area resisting the force.

Thomas Young

Stress is proportional to strain. The constant of proportionality is called as Young's modulus. Who Introduced this in 1807?

Stress

Obtained by dividing the differential load dP by the differential area dA over which it acts.

Pascal

What is the SI unit for stress?

unitless

Unit strain is

Poisson ratio

The ratio of the unit deformation or strains in a transverse direction is constant for stresses within the proportional limit. This is known as

Elastic limit

The stress beyond which the material will not return to its original shape when unloaded but will retain a permanent deformation.

(wL²) / 8

A simple beam carrying a uniform load of w throughout it entire length L has maximum moment of

(bh³)/3

The moment of inertia of a rectangular whose base is B and height H, about its base is

Design Stress = (Ultimate Stress) / Factor of Safety

In general design, stress and factor of safety are related as follows:

Weight

The dimensions of "Acceleration x Mass" is the same as that to

Zinc

Galvanized iron is a term referring to iron coated with

maximum at the wall

In a cantilever beam with a concentrated load at the free end, the moment is

depends on the materials and the finish condition of the surfaces

The coefficient of friction for dry surfaces