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Engineering Mechanics: Friction
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Engineering Mechanics: Friction
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25 Questions

1. The moment is the cross product of which two vectors in the calculations of the pivots and disks?
2. 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.
3. Wedges are used to transfer heavy loads.
4. When does the two wedge system is termed as self-locking system?
5. In the equation Wa/r generally used in the rolling frictional calculations, what does each stands for?
6. The frictional force always acts ____________ to the surface of the application of the friction.
7. The pivots are generally used in __________
8. The pivots and collar bearings are used as to support the axial load on the rotating shaft.
9. What if the moment of the force calculated about the axis of rolling is negative?
10. There are main two types of forces which are being stated in the free body diagram, they are generally the resultant forces which are being acted over the body. Which are they?
11. The normal force exerted by the surface of the wedge is normal to the surface of the ________
12. The moment of the force is the product of the force and the perpendicular distance of the axis and the point of action of the force. Is this also true for rolling?
13. In the simplification of the forces applied in the wedges net force acts at the ___________ of the loading body.
14. The blocks of heavy weights are being able to lift from the help of the wedges.
15. What is not the condition for the equilibrium in free body diagram for calculation of the normal forces?
16. 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.
17. Dry friction is also called _____________
18. Who gave the concept of Dry friction?
19. Theory of friction is explained over a block of weight W. Which of the following is the property of the surface on which block is present?
20. What does the moment of the force measured in the rolling of the body?
21. 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.
22. At what conditions does the Coulomb friction occur between the surfaces in contact of collar bearings or pivots?
23. A ____________ is a simple machine that is used as to transfer applied forces into much larger forces.
24. The collar bearings are generally used in __________
25. In the free-body diagrams involving the wedges we have the use of vector math, so for two vectors A and B, what is A.B (if they have angle α between them)?

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