Engineering Mechanics – Assignment 2

1. Consider the Truss Systems below and check all the answers that apply (more than one

answer may or may not be correct).

a. A is stable

b. B is stable

c. A is statically determinate, that is all the forces can be determined using principles of

statics.

d. B is statically determinate, that is all the forces can be determined using principles of

statics.

Ans: a, b, d

2. Consider the truss system below. A force of 3 kN is applied at B. Check all the answers

that apply (more than one answer may or may not be correct).

a. EC is under TENSION of 12kN (approx.)

b. EC is under COMPRESSION of 12kN(approx.)

c. AD is under COMPRESSION of 6kN(approx.)

d. CB is under COMPRESSION of 5.2kN(approx.)

Ans: a, c

3. Consider the Truss System. All the triangles shown are equilateral with the same side

length. If L=3kN, what is the value of the force (in kN) in member ED. (A “Numeric”

answer is expected and it must match exactly. Do not enter any alphabets in the answer,

only mention a number. A decimal number can also be entered.)

Ans : 1

4. Consider the Truss System below. All the dimensions and angles are as shown. A force

of 50 kN is applied at I. What is the value of the force in FD (in kN)? (A “numeric”

answer is expected and it must be reasonably close to the exact answer. Do not enter any

alphabets in the answer, only mention a number. A decimal number can also be entered.)

Ans : 70.7 kN

5. Consider the previous question. Check all that apply (more than one answer may or may

not be correct).

a. Force in ED is 100 kN

b. Force in ED is 50 kN

c. Forces from the supports at A and B can be determined.

d. Forces from the supports at A and B cannot be determined.

Ans: a, d

6. Consider below the beam AC supported at its ends and is stationary in this configuration.

A force of 10kN is applied as shown. Check all that apply (more than one answer may or

may not be correct). Note: B does not have a pin joint. ABC is entirely a rigid beam.

a. Shear force to the left of B is 4 kN

b. Shear force to the left of B is 6 kN

c. Shear force to the right of B is 4 kN

d. Shear force to the right of B is 6 kN

Ans: b, c

7. Consider the Truss System below. Multiple vertically downward forces act on the system.

The value of L is 10kN. Lengths of AB, BC, CD, DE, EF, FG, GH and HI are all equal.

Enter the value of the force in MG (in kN). (A “numeric” answer is expected and it must

match exactly. Do not enter any alphabets in the answer, only mention a number. A

decimal number can also be entered.)

Ans : 0

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