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. Normal force is equal to _______________

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

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

ThirdSecondFourthFirst

3. If the shear force creates a clockwise rotation then the force is said to be ____________

RotationalNegativeCollinearPositive

4. Which of the following is true for bending moment diagram?

Total moment of various forces acting on the body is the vector sum of all momentsTotal moment of various forces acting on the body is the algebraic sum of all momentsTotal moment of various forces acting on the body is the vector sum of all moments which is perpendicular to each other forcesTotal moment of various forces acting on the body is always zero

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

OrthogonalPerpendicularDistortionNormal

6. In the method of sections we probably use the joints and take out the forces in the beams.

TrueFalseMaybeDon't Know

7. 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?

Unit vector of the moment vectorThe perpendicular distance of the force from the axis of rotationThe direction vector of the momentThe magnitude of the moment caused by the force on the body

8. The design of the beam requires the knowledge of the variation of the ____________

External forcesRotational forcesInternal shear forceRolling forces

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

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

10. The internal loading can be found by ________________________

Distributed load methodMethod of volumeMethod of lineMethod of area

11. 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 in bending moment diagram is said to be______________

Sliding vectorCouple sliderCoupleSlider couple

12. For getting the normal force on the supports, we do what?

Make the horizontal sum of the forces equal to zeroMake the moment 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

13. 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?

Associative propertyPrinciple transmissibility of the forceNegative associative propertyDistributive property

14. Being inextensible the cable has ___________ length.

Average to zeroConstantZeroInfinite

15. Determine the normal force of the beam shown.

45N50N40N0N

16. Due to which property the cable, it offers no resistance to bending?

Extensible propertyFlexibility propertyStatic propertyNon-flexible property

17. The design of the beam requires the knowledge of the variation of the ____________

Rolling forcesExternal forcesRotational forcesBending moment

18. What is not the condition for the equilibrium in three dimensional system of axis for cable subjected to its own weight?

∑Fy=0∑F≠0∑Fz=0∑Fx=0

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

ExternalInternal rotationalCouple rotationalTranslational

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

Bending momentRotational momentTotal weightArea under shear diagram

21. We can make the graph of shear force acting on the beam. But not for the bending moment.

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

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

ExternalInternal rotationalTranslationalCouple rotational

23. Which of the following is correct in bending moment diagram w.r.t the moment (M) of the force (F) acting on the body at a distance L from the axis of the rotation?

M=FLsinθM=FLcosθM=F.LsinθM=FxLsinθ

24. Every point on the force vector which is the internal force is having the same magnitude and the same direction as the whole force vector have.

MaybeDon't KnowFalseTrue

25. The moment axis, force and the perpendicular distance in the bending moment diagram is lying in____________

Two planes perpendicular to each otherA single plane in the direction of the forceA single line in the direction of the forceA single plane in the direction of the perpendicular distance