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Engineering Mechanics – Assignment 3, 1. Consider a beam which is under the action of several distributed and point forces only., Check all that apply., a. SFD will be a continuous curve, b. SFD need not be a continuous curve, c. BMD will be a continuous curve, d. BMD need not be a continuous curve, Ans: b, c, 2. Consider the previous question. Now, certain point moments also act at certain positions, in the beam. Check all that apply., a. SFD will be a continuous curve, b. SFD need not be a continuous curve, c. BMD will be a continuous curve, d. BMD need not be a continuous curve, Ans: b,d, 3. Consider the following beam subject two transverse forces and a couple. What is the, magnitude of the reaction force at the left end (in kN)? (exact answer is expected, only, magnitude is asked – do not enter any sign), , Ans: 4, 4. Consider question 3. Shear force (in kN) in the beam at x=5m is? (exact answer is, expected, only magnitude is asked – do not enter any sign), Ans : 2

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5. Consider question 3. Bending moment (in kNm) in the beam at x=3m is? (exact answer is, expected, only magnitude is asked – do not enter any sign), Ans: 6, 6. Consider the beam shown below. Check all that apply., , a., b., c., d., , SFD in AB is a constant curve, SFD in DE is a constant curve, BMD in CD is a linear curve, BMD in DE is a parabolic curve, , Ans: a, c, d, 7. Consider question 6. What is the magnitude of the maximum bending moment (in kNm), across the beam? (answer will be considered correct if it falls in some range, only, magnitude is asked – do not enter any sign)., Ans: 8.66, 8. Consider the rigid frame ABCDE below. A force of 10kN acts at C. Check all that apply.

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a., b., c., d., , Axial force in AB is 2.5kN (magnitude) throughout., Bending moment in AB is non-zero., Shear force in BC is 2.5kN (magnitude) throughout., Shear force in CD is 5 kN(magnitude), , Ans: a, c, 9. Consider question 8. Check all that apply., a. Shear force in DE is zero., b. Shear force in AB is non-zero., c. Bending moment in DE is zero., d. Axial force in DE is zero., Ans: a, c, 10. What is the magnitude of the moment (in kNm) at a distance of 1m to the right of B?, (exact answer is expected up to 1 decimal place, only magnitude is asked – do not enter, any sign), Ans: 2.5