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REE(Objectives) > Engineering mechanics 51-100 > Flashcards

Engineering mechanics 51-100 Flashcards

1
Q

51.One calculates the work of a force on a rigid body exactly the same as one would calculate the work for a particle

A

Work of a force

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2
Q

52.A physical quantity that is completely described by a real number is called

A

Scalar

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3
Q
  1. a convenient means of representing physical quantities that have magnitude and direction
A

vectors

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4
Q
  1. The product of a scalar and a vector is a
A

Vector

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5
Q
  1. it is simply a vector whose magnitude is 1
A

unit vector

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6
Q
  1. It is sometimes called the scalar product.
A

Dot product

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7
Q
  1. To calculate for the force exerted on a charged particle by a magnetic field, _______ is used.
A

Vector product

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8
Q
  1. It is sometimes called the vector product.
A

Cross product

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9
Q
  1. Which of the following statement is false?
    The cross product is commutative;The cross product is associative with respect to scalar multiplication.;The cross product is distributive with respect to vector addition.;The angle between two identical vectors placed tail to tail is zero
A

The cross product is commutative

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10
Q
  1. When a force is represented by a vector, the straight line colinear with the vector is called the
A

line of action

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11
Q
  1. A system of forces is ______ if the lines of action of the forces intersect at a point.
A

Concurrent

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12
Q
  1. A system of two forces is __________ if the lines of action of the force lie in a plane.
A

Coplanar; two-dimensonal

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13
Q
  1. Force acting on an object is called a __________ if acts on the volume of the object.
A

Body force

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14
Q
  1. If each point on the object has the same constant velocity, this is referred to as.
A

Steady translation

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15
Q
  1. The moment of a force about a point P is equal to the sum of the moments of its components about P.
A

Varignon’s Theorem

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16
Q
  1. It is measure of the tendency of a force to cause rotation about a line or axis.
A

Moment

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17
Q
  1. A couple is composed of two forces that are
A

Equal, opposite and different lines of action

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18
Q
  1. Which of the following statemens is true about a couple?
    A couple does not tend to cause a rotation of an object.; The vector sum of the force couple always has a value.; A couple tends to cause a rotation of an object.; The moment it exerts is not the same about any point.
A

A couple tends to cause a rotation of an object

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19
Q
  1. If an object is on an inclined plane having an angle theta, the component of weight (w) parallel to incline is
A

w sin theta

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20
Q
  1. A type of force acting on a body due to the acceleration of gravity.
A

Load

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21
Q
  1. A type of force acting on a body caused by the friction between the body and the ground.
A

Shear

22
Q
  1. The unit of force, Newton, us equivalent to
A

kg-m/s^2

23
Q
  1. When a body is in contact with the ground, the force that is reflected back to the body is called.
A

Ground reaction force

24
Q
  1. The gravity in the moon is about.
A

1.6 m/s^2

25
Q
  1. The ground reaction force on a body can be represented by a single force
A

Center of pressure

26
Q
  1. The tuning effect on a body is dependent on which of the following?
    Mass of the load; Acceleration of gravity; Moment arm;
A

All of the above

27
Q
  1. The perpendicular distance of the force form the pount about which the body will turn is called.
A

Moment arm; lever arm

28
Q
  1. If the force is moved in the direction parallel to the direction of the force, the moment exerted by the force
A

Is unchanged

29
Q
  1. The moment of force is zero when?
    The applied force is zero; the force is applied at the moment axis.; The line of action of the force is parallel to the axis
A

All of the above

30
Q
  1. ____________ is finding a single force which shall be equal to two or more given forces when acting in given directions.
A

composition of forces

31
Q
  1. He is the father of the modern engineering mechanics
A

Stephen timoshenko

32
Q
  1. It is a method of applying mechanics that assumes all object are continuous.
A

Continuum Mechanics

33
Q
  1. Which of the follwoing is an example of contact force?
A

Air resistance Mechanics

34
Q
  1. It occurs when an object is moving across a surface.
A

Kinetic friction

35
Q
  1. Given mu=0.35 between the boject of mass 400 g and the floor, the object will ________ if pulled with a force 3N.
A

Move;Accelerate

36
Q
  1. Which of the following statements is correct?
    The coefficient of static friction is always less than 1; The coefficient of static friction is typically greater than the coefficient of kinetic friciton; The coefficient of kinetic friction is typically greater than the coefficient of static friction; The coefficient of static and kinetic friction are always equal.
A

The coefficient of static friction is typically greater than the coefficient of kinetic friciton

37
Q
  1. The equations that apply to bodies moving linearly (that is, one dimension) with uniform accelerations are often referred to as
    UVATS; SUVAT; UVAT
A

Either of the above

38
Q
  1. “Observed from an internal reference frame, the net force on a particle is proportional to the time rate of change of its linear momentum”. This is known as Newton’s _______ of motion.
A

Second Law

39
Q
  1. It is also known as quantity of motion
A

Moment

40
Q
  1. This concept assumes that the substance of the body is distributed throughout and completely fills the space it occupies.
A

Continuum

41
Q
  1. In fluids, ________ is used to assess to what extent the approximation of continuity can be made.
A

Knudsen Number

42
Q
  1. It is the time rate of change of any property of a continuum for a specified group of particles of the moving continuum body.
A

Material derivative

43
Q
  1. Material derivatives is also known as
    SUbstatntial derivative; Commoving derivative; Convective derivative
A

All of the above

44
Q
  1. The vector connecting the postions of a particle in the undeformed and deformed configuration is called the
A

displacement vector

45
Q

95.A_______ is a vector field of all displacement vectors for all particles in the body.

A

displacement field

46
Q
  1. __________ is the study of the physics of continuous solids with a defined rest shape.
A

Solid Mechanics

47
Q
  1. It is an experimental method for visualizing and analyzing fluid flow/
A

Partcile Image velocimetry

48
Q
  1. A Fluid at rest has no.
A

Shear stress

49
Q
  1. A property of fluids which is the force generated by a fluid in response to a velocity gradient.
A

Viscosity

50
Q
  1. These equation state that changes in momentum of fluid particles depend only on the external pressure and interval viscous forces acting on the fluid.
A

Navier- strokes Equations

REE(Objectives) (8 decks)

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