Engineering Mechanics & Thermodynamics
Assignment #1
1. The two structural members, one of which is in tension and the other in compression, exert the indicated
forces on joint O. Convert the two forces into a single resultant R. Use both vector sum and
parallelogram methods. (CLO1-C3)
2. Determine the resultant R of the two forces shown and angle θ which R makes with x-axis by (a)
applying the parallelogram rule for vector addition and (b) summing scalar components. (CLO1-C3)
3. As a trailer is towed in the forward direction, the force F = 500 N is applied as shown to the ball of the
trailer hitch. Determine the moment of this force about point O using (a) Varignon’s theorem and (b)
vector approach. (CLO1-C3)
4. A force F of magnitude 60 N is applied to the gear. Determine the moment of F about point O using (a)
Varignon’s theorem and (b) vector approach. (CLO1-C3)