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. Determine the normal force of the beam shown.

45N40N0N50N

2. If a force applied at any point in its line of action and is still creating the same moment about any fixed point say P, then the force is said to be a sliding vector. What is the name of this property in a bending moment diagram?

Distributive propertyPrinciple transmissibility of the forceNegative associative propertyAssociative property

3. The loading in the cable doesn’t change the ___________ of the cables.

Point at which the shear stress is zeroGeometryColourBending moment

4. The change in moment in shear stress diagrams is equal to _________

Bending momentArea under shear diagramRotational momentTotal weight

5. The shear diagram will jump downward if _________

Total weightRotational momentForce will act downwardsBending moment

6. The assumptions for the calculations for cables under distributed load are done for the cables. In that one of the assumption is that the cable is ___________

FlexibleStaticExtensibleNon-flexible

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

Relative translationRelative rotationRelative collapseRelative transformation

8. Change in the shear is equal to ____________

Bending momentRotational momentArea under loading curveTotal weight

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

MaybeTrueFalseDon't Know

10. The ____________ forces are used for the making of the free body diagram of the beams so as to apply the method of sections.

Couple rotationalInternal rotationalExternalTranslational

11. The shear diagram will jump upwards if there is __________

Total weightRotational momentBending momentChange in shear is positive

12. The force acting parallel/tangential to the beam is called _______________ force.

DistortionShearPerpendicularOrthogonal

13. The assumptions for the calculations are done for the cables under a distributed load. In that one of the assumption is that the cable is flexible and the other is that the cable is ___________

InextensibleNon-flexibleStaticExtensible

14. In the making of the shear force diagram or the bending moment diagrams, one method is used, distributed load. In this the distributed load will be considered positive if?

Loading acts leftwardLoading acts downwardLoading acts rightwardLoading acts upward

15. For getting the horizontal component of the support reactions what do we do?

Make the moment sum of the forces equal to zeroMake the horizontal sum of the forces equal to zeroMake the rotational sum of the forces equal to zeroMake the vertical sum of the forces equal to zero

16. The couple moment and the force in shear stress diagrams are divided to get the distance of the axis from the point of action of the force.

FalseDon't KnowTrueMaybe

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

Slightly sameSlightly differentDifferentSame

18. 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?

Question faultInfiniteNot possibleFinite

19. In the making of the shear force diagram or the bending moment diagrams, one method is used, distributed load. In this the distributed load will be considered positive if ____________

Loading acts upwardLoading acts rightwardLoading acts downwardLoading acts leftward

20. The equation of change in moment equals the area under the shear diagram is not applied when_________

Total weightRotational momentBending momentCouple moment acts

21. The internal loading can be found by ________________________

Method of areaMethod of lineDistributed load methodMethod of volume

22. The equation of change in a moment in shear stress diagrams equals area under shear diagram is not applied when?

Total weightRotational momentA concentrated force actsBending moment

23. The tensile force acting on the cable is in which direction w.r.t the cable?

At an angle of 2 radiansTangentialPerpendicularParallel

24. The ____________ forces are used are used in the method of sections for the calculation of the internal forces.

Internal rotationalCouple rotationalTranslationalExternal

25. In the support system of the bridges and trolley wheel ____________ form the main loading carrying element in the structure.

PillarsBeamsCableCement mortar