The angle of friction is:

Applied Mechanics and Graphic Statics
The angle of friction is:

The ratio of the friction and the normal reaction

The force of friction at which the body is just about to move

The force of friction when the body is in motion

The angle between the normal reaction and the resultant of normal reaction and limiting friction

The ratio of the friction and the normal reaction

The force of friction at which the body is just about to move

The force of friction when the body is in motion

The angle between the normal reaction and the resultant of normal reaction and limiting friction

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Applied Mechanics and Graphic Statics
If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then i. a force is required to move the body upwards ii. a force is required to move the body downward iii. the body will not be in equilibrium The correct answer is

only (ii)

both (i) and (ii)

both (i) and (iii)

only (i)

only (ii)

both (i) and (ii)

both (i) and (iii)

only (i)

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Applied Mechanics and Graphic Statics
The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be

cos (α - β)/cos (α + β)

sin (α + β)/sin (α - β)

sin (α - β)/sin (α + β)

tan (α - β)/tan (α + β)

cos (α - β)/cos (α + β)

sin (α + β)/sin (α - β)

sin (α - β)/sin (α + β)

tan (α - β)/tan (α + β)

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Applied Mechanics and Graphic Statics
Lami's theorem states that

Three coplanar forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two

If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium

Three forces acting at a point are always in equilibrium

Three coplanar forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two

Three coplanar forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two

If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium

Three forces acting at a point are always in equilibrium

Three coplanar forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two

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Applied Mechanics and Graphic Statics
A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

0.5

0.3

0.4

0.55

0.5

0.3

0.4

0.55

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Applied Mechanics and Graphic Statics
A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight

Vertical component of velocity remains constant

Kinetic energy of the ball remains constant

Speed of the ball remains constant

Horizontal component of velocity remains constant

Vertical component of velocity remains constant

Kinetic energy of the ball remains constant

Speed of the ball remains constant

Horizontal component of velocity remains constant

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Applied Mechanics and Graphic Statics

Applied Mechanics and Graphic Statics The angle of friction is:

Applied Mechanics and Graphic Statics The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be

Applied Mechanics and Graphic Statics Lami's theorem states that

Applied Mechanics and Graphic Statics A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

Applied Mechanics and Graphic Statics A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight

Applied Mechanics and Graphic Statics
The angle of friction is:

Applied Mechanics and Graphic Statics
The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be

Applied Mechanics and Graphic Statics
Lami's theorem states that

Applied Mechanics and Graphic Statics
A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

Applied Mechanics and Graphic Statics
A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight