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 in equilibrium
C. if a polygon representing forces acting at a point is closed then forces are in equilibrium
D. if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
E. none of the above.
A. not a replace them by a single force
B. to replace them by a single force
C. to replace them by a single force through C.G.
D. to replace them by a couple
E. to replace them by a couple and a force
A. magnitude
B. direction
C. point of application
D. all of the above
E. none of the above
A. magnitude
B. direction
C. position or line of action
D. all of the above
E. none of the above
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. kilogram
B. newton
C. watt
D. dyne
E. joule
A. one point
B. one plane
C. different planes
D. perpendicular planes
E. different points
A. same
B. more
C. less
D. may be less of more depending on nature of surfaces and velocity
E. has no correlation
A. tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction
B. ratio of limiting friction and normal reaction
C. the friction force acting when the body is just about to move
D. the friction force acting when the body is in motion
E. minimum force of friction