A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

P = W (cosα + μsinα)

P = W tanα

P = W tan (α + φ)

P = W (sinα + μcosα)

P = W (cosα + μsinα)

P = W tanα

P = W tan (α + φ)

P = W (sinα + μcosα)

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Engineering Mechanics
The static friction

All of these

Is independent of the area of contact, between the two surfaces

Always acts in a direction, opposite to that in which the body tends to move

Bears a constant ratio to the normal reaction between the two surfaces

All of these

Is independent of the area of contact, between the two surfaces

Always acts in a direction, opposite to that in which the body tends to move

Bears a constant ratio to the normal reaction between the two surfaces

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 80 and 90%

Between 60 and 70 %

Between 70 and 80%

1

Between 80 and 90%

Between 60 and 70 %

Between 70 and 80%

1

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Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 / m

1 + m

1 - m

m

1 / m

1 + m

1 - m

m

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG / Ah2

IP = IG + Ah2

IP = Ah2 / IG

IP = IG - Ah2

IP = IG / Ah2

IP = IG + Ah2

IP = Ah2 / IG

IP = IG - Ah2

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Engineering Mechanics
Moment of inertia of a circular section about its diameter (d) is

πd4/32

πd3/32

πd3/16

πd4/64

πd4/32

πd3/32

πd3/16

πd4/64

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Engineering Mechanics

Engineering Mechanics A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

Engineering Mechanics The static friction

Engineering Mechanics An ideal machine is one whose efficiency is

Engineering Mechanics The maximum mechanical advantage of a lifting machine is

Engineering Mechanics Moment of inertia of a circular section about its diameter (d) is

Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

Engineering Mechanics
The static friction

Engineering Mechanics
An ideal machine is one whose efficiency is

Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

Engineering Mechanics
Moment of inertia of a circular section about its diameter (d) is