## Applied Mechanics and Graphic Statics A cube on a smooth horizontal surface

Cannot be in unstable equilibrium
Can be in any of these states
Cannot be in neutral equilibrium
Cannot be in stable equilibrium

4
1/3
3
1/4

## Applied Mechanics and Graphic Statics The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is ½, the velocities of separation of the balls will be equal to

Original velocity in the same direction
Half the original velocity in the same direction
Original velocity in the opposite direction
Half the original velocity in the opposite direction

## Applied Mechanics and Graphic Statics A smooth cylinder lying on its convex surface remains

In neutral equilibrium
In unstable equilibrium
In stable equilibrium
Out of equilibrium

18
20
26
15

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

The force of friction always acts in a direction opposite to that in which a body is moving
All of these
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