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

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

remain horizontal

slant down towards direction of pull

unpredictable

slant up towards direction of pull

remain horizontal

slant down towards direction of pull

unpredictable

slant up towards direction of pull

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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 are parallel

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

the lines of action of these forces meet in a point

these forces are equal

the lines of action of these forces are parallel

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

the lines of action of these forces meet in a point

these forces are equal

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Strength of Materials
A framed structure is perfect if it contains members equal to (where n = number of joints in a frame)

2n-l

n-l

n-2

2n-3

2n-l

n-l

n-2

2n-3

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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

Minimum when it acts at the C.G. of the body

The same at every point in its line of action

Maximum when it acts at the center of gravity of a body

Different at different points in its line of action

Minimum when it acts at the C.G. of the body

The same at every point in its line of action

Maximum when it acts at the center of gravity of a body

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Strength of Materials
If a number of forces act simultaneously on a particle, it is possible

To replace them by a couple

To replace them by a single force through C.G.

To replace them by a single force

Not a replace them by a single force

To replace them by a couple

To replace them by a single force through C.G.

To replace them by a single force

Not a replace them by a single force

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Strength of Materials
Forces are called coplanar when all of them acting on body lie in

one point

different planes

one plane

perpendicular planes

one point

different planes

one plane

perpendicular planes

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Strength of Materials

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

Strength of Materials A framed structure is perfect if it contains members equal to (where n = number of joints in a frame)

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

Strength of Materials If a number of forces act simultaneously on a particle, it is possible

Strength of Materials Forces are called coplanar when all of them acting on body lie in

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

Strength of Materials
A framed structure is perfect if it contains members equal to (where n = number of joints in a frame)

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

Strength of Materials
If a number of forces act simultaneously on a particle, it is possible

Strength of Materials
Forces are called coplanar when all of them acting on body lie in