PHYSICS AND ENG MECHANICS

Dynamics

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

The object’s momentum changes

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

Moment of inertia

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

Velocity

Momentum is the product of mass and

Increases as the distance of the axis moves farther from the centroid

The moment of inertia of a plane figure,

Maximize velocity

To maximize the horizontal range of the projectile, which of the following 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

All of the above

The action of a force is characterized by

All of the above

For the system to be equilibrium,

Couple

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

Torque

The

No net torque acts on it

A body is said to be in “rotational equilibrium” when

Equal

A couple consists of two forces,

Center of mass

The

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 bet them. This is known as

bh³/3

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

4

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

πr⁴/4

What is the moment of inertia of a circle

4

The moment of inertia of the circle with respect to its tangent is

3

The moment of inertia of rectangle with respect to be the base is

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

A structure is called

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 a 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 I 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 of weight a. The tension in the wire must

All of the above

The built-in or fixed support is capable of supporting

F = ma

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

Newton’s second law of motion

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

Ductility

Factor of safety

It is the ratio og 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 of modulus 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 symmetrically loaded simple beam, the maximum moment occurs at

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

Poisson ratio is

Maxwell diagram

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

Working stress

The actual stress the material has when under load.

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

Yield 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 its 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 dimension 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

Q = -mLf

In physics, if Lf and Lv are the latent heat of fusion and vaporization respectively, which of the following equations apply in determining the amount of energy needed to freeze a liquid

Ductility

Elastic collision

When the total kinetic energy of system is the same as before and after collision of two bodies, it is called

Motion and mass

Momentum is a property related to the object’s

Latent heat of fusion

The amount of heat needed to change solid to liquid is

Elastic potential energy

The energy stored in stretched elastic material such as a spring is

Coulomb’s law

According to this law, “the force between two charges varies directly as the magnitude of each charge and inversely as the square of the distance between them”.

Acceleration

A free falling body is a body in rectilinear motion and with constant

Directly proportional to the square of the tangential velocity

Centrifugal force

Pascal’s principle

The fluid pressure is the same in all directions. This is known as

Compressibility

The reciprocal of bulk modulus of any fluid is called

Velocity

Momentum is the product of mass and

746 watts

One horse power is equivalent to

334 kJ/kg

What is the latent heat fusion required to turn ice to liquid?

Zero

What is the value of the work done for closed reversible, isometric system?

Bernoulli’s theorem

The sum of the pressure head, elevation head and the velocity head remains constant. This is known as

Surface tension

A leak from a faucet comes out in separate drops. Which of the following is the main cause of this phenomenon?

Temperature

Absolute viscosity is essentially independent of pressure and is primarily dependent on

Illuminance

It describes the luminous flux incidence per unit area and is expressed in lumens per square meter.

Standing waves are produced

When two waves of the same frequency, speed and amplitude traveling in opposite directions are superimposed,

Force and time

Linear momentum is the product of mass and velocity and this can be expressed also as a function of

Convection

The transmission of heat from one place to another by fluid circulation between the spots of different temperature is called

Entropy

It is the measure of the randomness of the molecules of a substance.

Specific heat

The amount of heat needed to raise the temperature of one pound of that substance one degree Fahrenheit is

Water manometer

What is the gage used to measure 0.001 to 1 atm pressure?

Gamma radiation

One of the types of non-material nuclear radiation is

The flower pot hits the ground first and with a higher speed than the glass

A flower pot falls of a ledge of 5th floor window, just as it passes the third floor window, someone accidently drops a glass of water from the window. Which of the following is true?

Newton’s second law of motion

Whenever a net force acts on a body, it produces an acceleration in the direction of a resultant force, an acceleration which is directly proportional to the resultant force and inversely proportional to the mass of the body. This theory is popularly known as