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Engineering Mechanics: Friction
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Engineering Mechanics: Friction
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25 Questions

1. In the equation A.(rxF) the r is heading from ______________ and ending at _____________
2. We show the net forces by the help of __________ forces.
3. When does the two wedge system is termed as self-locking system?
4. A phenomena is there in these collar bearings and pivots, which is very helpful in the supporting of the machines, and that is _____________
5. The normal force exerted by the surface of the wedge is normal to the surface of the ________
6. A ____________ is a simple machine that is used as to transfer applied forces into much larger forces.
7. We first make equilibrium equations of the body by considering all the three dimensional forces acting on the section chosen and then the free body diagram is made and solved.
8. In the problems regarding the friction and normal force calculations, there is no scope of the two force and three force systems.
9. In rolling, there is the involvement of the vector math. So for rolling which of the following is correct? (For A representing the vector representation of the axis of rotation, r the radius vector and F the force vector)
10. The coefficient of friction between the body being slided over the wedge and the wedge surface is generally determined by ____________
11. If a car is moving forward, what is the direction of the moment of the moment caused by the rolling of the tires, assume non slippery surface?
12. The moment is the cross product of which two vectors in the calculations of the pivots and disks?
13. In the equation Wa/r generally used in the rolling frictional calculations, what does each stands for?
14. For equilibrium the normal forces acts in which direction in the free body diagrams?
15. The blocks of heavy weights are being able to lift from the help of the wedges.
16. In the explanation of the theory of friction, the block used to have an assumption. That is the upper portion of the block is considered to be rigid.
17. ____________ is the phenomena that resist the movement of the two surfaces in contact.
18. What if the moment of the force calculated about the axis of rolling is negative?
19. The ___________ forces do not cause the rotation/rolling of the body if the rotation is considered in about the axis of the body or the centroid axis of the body.
20. Coplanar forces are not easily simplified in the simplification of the force and couple system in the calculations of forces in the pivots and collar bearings.
21. At what conditions does the Coulomb friction occur between the surfaces in contact of collar bearings or pivots?
22. What is not the condition for the equilibrium in free body diagram for calculation of the normal forces?
23. Sometimes in the calculations involving the wedges, there are situations when there is a toppling effect on the body. In that, if the net moment of the body is zero that means the distance between the force and the rotational axis is zero.
24. To know the rotations involved in the disks we use right handed coordinate system, in that system which of the following is followed (consider the mentioned axis to be positive)?
25. For the rolling of the body the calculation of the moment of the force about the axis of rolling, the cross product table, i.e. the 3X3 matrix which is made for doing the cross product having 3 rows, contains three elements. Which are they from top to bottom?

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