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Chapter:

Internal-Forces

1. What is not condition for equilibrium in three dimensional system of axis for composite bodies?

∑Fx=0 ∑Fy=0 ∑Fz=0 ∑F≠0

∑F≠0

For equilibrium in three dimensional system of axis we have all conditions true as, ?Fx=0, ?Fy=0 and ?Fz=0. Also we have summation of forces equal to zero. Which is not a non-zero value.

Hint Answer

2. We first make equilibrium equations for fluid pressure and n free body diagram and n solve question?

True False

False

We first make free body diagram and n we make equilibrium equations to satisfy given conditions. This helps us to solve question easily. As this reduces part of imagination and increases accuracy too.

Hint Answer

3. Composite materials can be of ______ shapes.

Any Circular only Rectangular only Oval only

Any

The composite materials can be of any shape. This means that shape of material can be varied. Thus any shape can be imparted to composite materials and n be used in industries variedly.

Hint Answer

4. Centroid determination involves calculations of various forces. In that forces are having various properties. That is force is developed by a support that not allows ____ of its attached member.

Translation Rotation Addition Subtraction

Translation

The force developed by a support doesn?t allow translation of its attached member. This is basic condition for equilibrium of forces in any dimension. This rule is applied when support reactions are taken into account for equilibrium of body.

Hint Answer

5. Determine moment generated at R.

$Determine moment generated at R.\r\n$

18.75KNm 8.75KNm 1.75KNm 175KNm

18.75KNm

The loading acting upward is considered to be positive. This is done as to decrease time used for calculations. If method of sections is being applied at complex sections for determination of unknown forces, much time is required for it. Thus main motto is to make calculations easy and make less use of time.

Hint Answer

6. Determine y coordinate of centroid of wire in shape of circle as shown.

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$Determine y coordinate of centroid of wire in shape of circle as shown.\r\n\r\n\r\nadvertisement\r\n\r\n\r\n\r\n\r\n$

2R/π 2/π 2R/3 2R/5

2R/π

The weight of body is sum of all small weights that are been applied by all particles. The smaller particle smaller weight it applies. Thus total weight of body is summation of all infinite number of small weights applied to body.

Hint Answer

7. Pressure acts _________ to surface of body.

Normal Linear Parallel Coplanar

Normal

The pressure is always acted normal to surface of body. Thus pressure plays a role as a vector in this case. So mainly pressure must be considered as normal to surface of body.

Hint Answer

8. If solving question in 3D calculations is difficult, n use 2D system and n equate ratio of product of centroid of section to its mass to total mass of body to centroid.

True False

False

The answer is obviously no. Still, if we are having any difficulty in making vector components, n we can go in 2D. As if particle is in equilibrium, net force will be zero. No matter where you see first. Net force is zero. But statement here is not correct about centroid.

Hint Answer

9. The net forces of acting on body need to be zero. This is also applicable for simply supported structures. This means that support reaction is also counted in making net force zero.

True False

True

The support reactions of beam is also counted in making of forces zero. As far as net force is concerned support reaction does affect conditions for equilibrium of body. Hence one needs to take care of support reactions of structures too.

Hint Answer

10. Volume is best given by _______

Product of mass and density Ratio of mass to density Addition of mass and density Subtraction of mass and density

Ratio of mass to density

The density is ration of mass to volume of body. Thus arranging m and volume is said to be a ratio of mass to density. This equation is generally used in calculations of centroid of body or centre of gravity.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Engineering-Mechanics

Force Vectors

Equilibrium of a Particle

Equilibrium of a Particle

Force System Resultants

Force System Resultants

Equilibrium of a Rigid Body

Equilibrium of a Rigid Body

Structural Analysis

Structural Analysis

Internal Forces

Internal Forces

Friction

Centre of Gravity and Centroid

Centre of Gravity and Centroid

Moments of Inertia

Moments of Inertia

Principle of Virtual Work

Principle of Virtual Work

Topics

This Chapter Internal-Forces consists of the following topics

Centre of Gravity and Centroid

What is not condition for equilibrium in three dimensional system of axis for composite bodies?

We first make equilibrium equations for fluid pressure and n free body diagram and n solve question?

Composite materials can be of ______ shapes.

Centroid determination involves calculations of various forces. In that forces are having various properties. That is force is developed by a support that not allows ____ of its attached member.

Determine moment generated at R.

$Determine moment generated at R.\r\n$

;

Determine y coordinate of centroid of wire in shape of circle as shown.

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$Determine y coordinate of centroid of wire in shape of circle as shown.\r\n\r\n\r\nadvertisement\r\n\r\n\r\n\r\n\r\n$

;

Pressure acts _________ to surface of body.

If solving question in 3D calculations is difficult, n use 2D system and n equate ratio of product of centroid of section to its mass to total mass of body to centroid.

The net forces of acting on body need to be zero. This is also applicable for simply supported structures. This means that support reaction is also counted in making net force zero.

Volume is best given by _______

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