Strength of Materials
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

slant down towards direction of pull
remain horizontal
slant up towards direction of pull
unpredictable

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Different at different points in its line of action
Maximum when it acts at the center of gravity of a body
The same at every point in its line of action
Minimum when it acts at the C.G. of the body

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Strength of Materials
Center of percussion is

point of suspension
the point of metacentre
the point of C.G.
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces meet in a point
the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces meet in a point & the lines of action of these forces are parallel

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