Engineering Mechanics Assignment Sheet – 3 Module – 3 Friction & Forces in Space

Assignment Question1. A block having mass 40 Kg and dimension as shown in Fig, is resting on a flat surface. The

coefficient of static friction between the block and the surface is 0.3. Find the magnitude of tension T required to cause motion. Also describe in what manner motion would take place if:a) h = 15 cm b) h = 22 cm

2. A 100 wedge is to be forced under end B of 6 Kg rod AB. If µs = 0.4 between the wedge and rod and 0.2 between the wedge & the floor. Determine the smallest force P require to raise end B of rod.

3. There block are placed on the surface one above the other as shown in fig. The static coefficient between the blocks and block C and surface is also shown. Determine the maximum value of P that can be applied before any Slipping take place. [Ans: 25.5 N]

[May 08]

4. A plate foundation is subjected to five vertical forces as shown in fig. Replace these five forces by means of single vertical forces and find the point of replacement.

Engineering Mechanics Assignment Sheet – 3 Module – 3 Friction & Forces in Space

5. Force F = (3i – 4j + 12k) N acts at point A (1, -2, 3). Findi) Moment of force about originii) Moment of force about point B(2,1,2)m

[Ans: MFO = (-12i – 3j -2k) Nm, MF

B= (-32i + 15j + 13k) NM]

6. Determine the tension in cable AB, AC & A. If weight of cylinder is 160 Kg.