Internal Forces topics include: Structural members, shear and moment diagrams, cables, bending moment and shear stress diagram, cables subjected to a distributed load and its own weight. In engineering mechanics, internal forces are actions that change the state of motion of a body. They can be represented mathematically or graphically.  Here are some types of internal forces: Axial force: Also known as the normal force, this is a compression or tension force that acts along the extension of a structure member. Shear force: This force acts perpendicular to the alignment of the... Show more

Internal Forces topics include: Structural members, shear and moment diagrams, cables, bending moment and shear stress diagram, cables subjected to a distributed load and its own weight.

In engineering mechanics, internal forces are actions that change the state of motion of a body. They can be represented mathematically or graphically. 

Here are some types of internal forces:
Axial force: Also known as the normal force, this is a compression or tension force that acts along the extension of a structure member.
Shear force: This force acts perpendicular to the alignment of the member.
Moment force: This is the turning result of a force. 

Other types of internal forces include:
Compression: A squeezing force applied to a material.
Tension: A force that causes a substance to stretch.
Torsion: A force that twists or turns.
Bending: The process of bending a straight material into a curved shape. 

The equation for calculating internal forces within a structure is d 2 M d x 2 = V. 
To determine internal forces, it is necessary to know about the positive and negative sides of the section

Related Test: Engineering Mechanics Practice Test: Structural Analysis

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Engineering Mechanics Practice Test: Internal Forces

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25 Questions

1. Simply supported beams are pinned at both the ends.

MaybeDon't KnowTrueFalse

2. The assumptions for the calculations are done for the cables. In that one of the assumption is that the cable is flexible and the other is that the cable is ___________

StaticExtensibleNon-flexibleInextensible

3. The force acting perpendicular to the beam is called _______________ force.

DistortionOrthogonalPerpendicularNormal

4. Normal force is equal to _______________

The net vertical forceThe net horizontal forceThe net vertical force with a negative signThe net horizontal force with a negative sign

5. According to the _________ law of Newton the loadings at the sections must act opposite to the forces applied.

FourthFirstThirdSecond

6. The tensile force acting on the cables under distributed load is in which direction w.r.t the cable?

At an angle of 2 radiansTangentialParallelPerpendicular

7. The shear diagram will jump downward if _________

Force will act downwardsRotational momentBending momentTotal weight

8. The internal loading can be found by _________________

Method of areaMethod of sectionsMethod of volumeMethod of line

9. The couple in the beam is simplified easily by the help of right hand rule. But the forces simplification is not possible as there is no such system of rules so that the forces can be simplified.

The first part of the statement is true and other part is true tooThe first part of the statement is true and other part is falseThe first part of the statement is false and other part is trueThe first part of the statement is false and other part is false too

10. The various points in the cable is facing a ____________ tensile force.

NonInsufficientConstantVariable

11. If any force is applied in the direction of the positive x-axis, and there are three different points in bending moment diagram on which the moment of this force is to be calculated. Then if these three points are on the positive side of the y-axis with varying distance, then what will be the direction of the moment caused by the force to the individual point?

Towards positive z-axisTowards positive x-axisTowards negative z-axisTowards positive y-axis

12. Flexible cable with chains combine ___________ with lightness and often are used in structures for support.

MassDensityStrengthVolume

13. If the bending of the beam is concave upwards then the bending moment developed is called __________ moment.

CollinearRotationalNegativePositive

14. Beams are long and ________ structures that are being made to support the loadings.

VerticalRoundedStraightCurled

15. Rotational moments are not counted in the free body diagrams and the evaluation of the internal forces by the method of sections.

Don't KnowTrueFalseMaybe

16. The couple moment prevents the beam from which of the following process?

Relative translationRelative transformationRelative rotationRelative collapse

17. If the unknown variables in the calculations are more than the known quantities, then the number of equations required to solve all the unknown variables are?

InfiniteFiniteNot possibleQuestion fault

18. The shear diagram will jump downward if the _________________

Rotational momentForce will act downwardsBending momentTotal weight

19. Flexible cables under distributed load with chains combine ___________ with lightness and often are used in structures for support.

StrengthMassDensityVolume

20. Which of the following is true for a beam having various forces acting over it?

If we are considering the clockwise direction to be negative then the rotation along the counter clockwise direction is neither positive nor negative as we only pre assumed the clockwise directionIf we are considering the clockwise direction to be positive then the rotation along the counter clockwise direction is also positive as no such assumptions can be takenIf we are considering the clockwise direction to be negative then the rotation along the counter clockwise direction is also negative as no such assumptions can be takenIf we are considering the clockwise direction to be positive then the rotation along the counter clockwise direction is negative

21. The magnitude of the resultant of the two vectors in calculations for cable subjected to its own weight is always:

Axis we choose to calculate the magnitudeGreater than one of the vector’s magnitudeSmaller than one of the vector’s magnitudeDepends on the angle between them

22. What does FLsinθ mean/represents in bending moment diagram for the moment (M) of the force (F) acting on the body at a distance L from the axis of the rotation?

The perpendicular distance of the force from the axis of rotationThe magnitude of the moment caused by the force on the bodyUnit vector of the moment vectorThe direction vector of the moment

23. The tensile force acting on the cable subjected to its own weight is in which direction w.r.t the cable?

At an angle of 2 radiansParallelTangentialPerpendicular

24. The magnitude of each loading will be ___________ at various points along the axis of the member of the beam.

Slightly sameDifferentSameSlightly different

25. Determine the normal force of the beam shown.

0N40N50N45N