A. their total sum is zero
B. two resolved parts in two directions at right angles are equal
C. sum of resolved parts in any two per-pendicular directions are both zero
D. all of them are inclined equally
E. none of the above
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Related Mcqs:
- The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are____________________?
- A. 2 and V6 B. 3 and 1 kg C. V5andV5 D. 2 and 5 E. none of the above...
- If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?
- A. meet in a point B. be all parallel C. at least two of them must meet D. all the above are correct E. none of the above...
- Forces are called coplanar when all of them acting on body lie in________________?
- A. one point B. one plane C. different planes D. perpendicular planes E. different points...
- If three forces acting in different planes can be represented by a triangle, these will be in________________?
- A. non-equilibrium B. partial equilibrium C. full equilibrium D. unpredictable E. none of the above...
- Two non-collinear parallel equal forces acting in opposite direction________________?
- A. balance each other B. constitute a moment C. constitute a couple D. constitute a moment of couple E. constitute a resultant couple...
- The necessary condition for forces to be in equilibrium is that these should be_______________?
- A. coplanar B. meet at one point ; C. both A. and B. above D. all be equal E. something else...
- If a rigid body is in equilibrium under the action of three forces, then_______________?
- A. these forces are equal B. the lines of action of these forces meet in a point C. the lines of action of these forces are parallel D. B. and C. above E. none of the above...
- A force acting on a body may_______________?
- A. introduce internal stresses B. balance the other forces acting on it C. retard its motion D. change its motion E. all of the above...
- A single force and a couple acting in the same plane upon a rigid body________________?
- A. balance each other B. cannot balance each other C. produce moment of a couple D. are equivalent E. none of the above...
- Which is the correct statement about law of polygon of forces ?
- A. if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium B. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are...
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