**1.The unit of force in S.I.
units is ? newton **

**2.The unit of work or energy in S.I. units is ? joule**

**3. The unit of power in S.I. units is ? wat**

**4. Forces are called concurrent when
their lines of action meet in ? one point**

**5. Forces are called coplanar when all of them acting on body lie in ? one plane**

**6.A force acting on a body may ?**

**introduce
internal stresses**

**balance the other forces
acting on it**

**retard its motion**

**change its motion****7.Which of the following is not the unit of distance ?**

**milestone**

**8. When trying to turn a key into a lock, following is applied ? couple**

**9. Which of the following is not a scalar quantity ? acceleration.**

**10. A number of forces acting at a point will be in equilibrium if ?**

**11. If two equal forces of magnitude P act at an angle 9°, their resultant will be ?**

**IP cos 9/2**

**12. The algebraic sum of the resolved part of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of ?**

**Resolution of forces**

**13. The resolved part of the resultant of two forces inclined at an angle 9 in given direction is equal to ?**

**The algebraic sum of the resolved part of the forces in the given direction**

**14. The weight of a body is due to ?**

**gravitational force of attraction towards the center of the earth**

**15. The forces which meet at one point, but their line of action do not lie in a plane, are called ?**

**non-coplanar concurrent forces**

**16. Which of the following is a vector quantity ?**

**momentum**

**17. A number of forces acting at a point will be in equilibrium if ?**

**Sum of resolved parts in any two per-pendicular direction are both zero**

**18. Two non-collinear parallel equal forces acting in opposite direction ?**

**Constitute a couple**

**19. Law of triangle of forces ?**

**If three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium**

**20. D'Alembert's principle is used for ?**

**reducing the problem of kinetics to equivalent statics problem**

**21. According to Lami's theorem ?**

**If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two**

**22. Two coplanar couples having equal and opposite moments ?**

**can not balance each other**

**23. A framed structure is perfect if it contains members equal to ?**

**2n-3**

**24. The product of either force of couple with the arm of the couple is called /**

**moment of the couple**

**25. The center of gravity of a uniform lamina lies at ?**

**the mid point of its axis**

**26. Center of gravity of a solid cone lies on the axis at the height ?**

**one-fourth of the total height above base**

**27. Center of percussion is ?**

**the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis**

**28. Center of gravity of a thin hollow cone lies on the axis at a height of ?**

**one-third of the total height above base**

**29. Vector quantity ? Momentum**

**30. The unit of force in S.I. system of unit is ?**

**Newton**

**31. One Kg of force is equal to ?**

**9.8 N**

**32. The process of finding out the resultant force is called ______of forces ?**

**Composition**

**33. Concurrent forces are those forces whose lines of action ?**

**Meet at one point**

**34. The forces which meet at one point and their lines of action also lie on the same plane, are known as ?**

**Coplanar Concurrent forces****35. Center of percussion is ?**

**The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis**

**sum
of resolved parts in any two per-pendicular directions are both zero**

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