Applied Mechanics and Graphic Statics
A stone is whirled in a vertical circle, the tension in the string, is maximum

At all the positions
When the stone is at the lowest position
When the stone is at the highest position
When the string is horizontal

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Applied Mechanics and Graphic Statics
The following statement is one of the laws of Dynamic friction

All of these
The force of friction always acts in a direction opposite to that in which a body is moving
For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction

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