APPLIED MECHANICS

Q: The angle of friction is :

(a) :  The ratio of the friction and the normal reaction
(b) :  The force of friction when the body is in motion
(c) :  The angle between the normal reaction and the resultant of normal raction and limiting friction
(d) :  The force of friction at which the body is just about to move.
(e) :  None of these
Answer:  The angle between the normal reaction and the resultant of normal raction and limiting friction
Explanation:  

Q: If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called

(a) :  virtual work
(b) :  imaginary work
(c) :  zero work
(d) :  negative work.
(e) :  None of these
Answer:  negative work.
Explanation:  

Q: The resolved part of the resultant of two forces inclined at an angle θ in a given direction is

(a) :  algebraic sum of the resolved parts of the forces in the direction
(b) :  arithmetical sum of the resolved parts of the forces in the direction
(c) :  difference of the forces multiplied by cosine θ°
(d) :  sum of the forces multiplied by the sine θ
(e) :  sum of the forces multiplied by the tangent θ°.
Answer:  algebraic sum of the resolved parts of the forces in the direction
Explanation:  

Q: The centre of gravity of a triangle is at the point where three

(a) :  medians of the triangle mee
(b) :  perpendicular bisectors of the sides of the triangle mee
(c) :   bisectors of the angle of the triangle meet
(d) :  all of these
(e) :  None of these
Answer:  medians of the triangle meet
Explanation:  

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