Engineering Mechanics

Chapter 3 : Moments and Their Applications „„„„„ 29 Mathematically, moment, M=P × l where P= Force acting on the body, and l= Pe ...

(^30) „„„„„ A Textbook of Engineering Mechanics 3.8. VARIGNON’S PRINCIPLE OF MOMENTS (OR LAW OF MOMENTS) It states, “If a number ...

Chapter 3 : Moments and Their Applications „„„„„ 31 Example 3.2. A uniform plank ABC of weight 30 N and 2 m long is supported at ...

(^32) „„„„„ A Textbook of Engineering Mechanics ∴ 2 3 W Pr×= ×r π or 2 3 W P= π Ans. Example 3.4. A uniform wheel of 600 mm diam ...

Chapter 3 : Moments and Their Applications „„„„„ 33 A beam AB 5 m long is supported at its ends A and B. Two point loads W 1 an ...

(^34) „„„„„ A Textbook of Engineering Mechanics Example 3.5. Three forces of 2P, 3P and 4P act along the three sides of an equil ...

Chapter 3 : Moments and Their Applications „„„„„ 35 Solution. The system of given forces is shown in Fig. 3.12. Magnitude of the ...

(^36) „„„„„ A Textbook of Engineering Mechanics Fig. 3.14. and now resolving all the forces vertically, ΣV = 7 + 8 cos α – 5 cos ...

Chapter 3 : Moments and Their Applications „„„„„ 37 Let α = Angle which the resultant force makes with the horizontal. ∴ –15.656 ...

(^38) „„„„„ A Textbook of Engineering Mechanics 3.11.LEVERS A lever is a rigid bar (straight, curved or bent) and is hinged at o ...

Chapter 3 : Moments and Their Applications „„„„„ 39 Example 3.9. Find the tension required in the operating wire to raise the si ...

(^40) „„„„„ A Textbook of Engineering Mechanics Example 3.12. The lever ABC of a component of a machine is hinged at B, and is s ...

Chapter 3 : Moments and Their Applications „„„„„ 41 Fig. 3.20. Compound levers A little consideration will show, that in a compo ...

(^42) „„„„„ A Textbook of Engineering Mechanics A square ABCD of 60 mm side is subjected to force of 10 N, 20 N, 30 N and 40 N ...

Chapter 4 : Parallel Forces and Couples „„„„„ 43 Parallel Forces and Couples 43 Contents Introduction. Classification of Parall ...

(^44) „„„„„ A Textbook of Engineering Mechanics their directions : Like parallel forces. Unlike parallel forces. 4.3. LIKE PAR ...

Chapter 4 : Parallel Forces and Couples „„„„„ 45 Now taking clockwise and anticlockwise moments of the forces about C and equati ...

(^46) „„„„„ A Textbook of Engineering Mechanics Point where the resultant force acts Let x = Distance between the lines of actio ...

Chapter 4 : Parallel Forces and Couples „„„„„ 47 Similarly draw bc and cd equal to and parallel to the forces BC (P 2 ) and CD ...

(^48) „„„„„ A Textbook of Engineering Mechanics Now select some suitable point o, and join oa, ob, oc, od and oe. Now take some ...