Statics - Mechanics for Engineers UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Theoretical mechanics - Correct answers✔✔The science which treats of the general laws of
motion and equilibrium of material bodies and of their resulting mutual interactions.
The branches of Mechanics - Correct answers✔✔Mechanics is divided into statics, kinematics,
and dynamics.
The Subject of Statics - Correct answers✔✔The branch of mechanics which studies the laws of
composition of forces and the conditions of equilibrium of material bodies under the action of
forces.
First Principle of Statics - Correct answers✔✔A free rigid body subjected to the action at two
forces can be in equilibrium if, and only if, the two forces are equal in magnitude (F1=F2),
collinear, and opposite in direction
Second Principle of Statics - Correct answers✔✔The action of a given force system on a rigid
body remains unchanged If another balanced force system is added to, or subtracted from, the
original system.
Corollary of the 1st and 2 nd Principles. - Correct answers✔✔The point of application of a force
acting on a rigid body can be transferred to any other point on line of action of the force without
altering its effect.
3 rd principle of the statics
, (Parallelogram Law) - Correct answers✔✔Two forces applied at one point of a body have as
their resultant a force applied at the same point and represented by the diagonal of a
parallelogram constructed with the two given forces as its sides.
4th principle of statics
(Newton's 3rd law) - Correct answers✔✔To any action of one material body on another
there is always an equal and opposite reaction.
5th principle of statics
(Principle of Solidification) - Correct answers✔✔If a freely deformable body subjected to the
action of a force system is in equilibrium, the state of equilibrium will not be disturbed if the
body solidifies (becomes rigid).
Constraint body - Correct answers✔✔A body whose displacement in space is restricted by other
bodies, either connected to or in contact with it.
Smooth. Plane (Surface) or Support. - Correct answers✔✔A smooth surface is one whose
friction can be neglected in the first approximation. Therefore, the reaction N of a smooth surface
or support is directed normal to both contacting surfaces at their point of contact and is applied at
that point.
Direction of tension force - Correct answers✔✔The reaction T of the string is thus directed along
the string towards the point of suspension
Cylindrical Pin (Bearing) - Correct answers✔✔When two bodies are joined by means of a pin
passing through holes in them the connection is called a joint or hinge. In this case neither the
magnitude R nor the direction (angle a) of force R are immediately apparent.
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Theoretical mechanics - Correct answers✔✔The science which treats of the general laws of
motion and equilibrium of material bodies and of their resulting mutual interactions.
The branches of Mechanics - Correct answers✔✔Mechanics is divided into statics, kinematics,
and dynamics.
The Subject of Statics - Correct answers✔✔The branch of mechanics which studies the laws of
composition of forces and the conditions of equilibrium of material bodies under the action of
forces.
First Principle of Statics - Correct answers✔✔A free rigid body subjected to the action at two
forces can be in equilibrium if, and only if, the two forces are equal in magnitude (F1=F2),
collinear, and opposite in direction
Second Principle of Statics - Correct answers✔✔The action of a given force system on a rigid
body remains unchanged If another balanced force system is added to, or subtracted from, the
original system.
Corollary of the 1st and 2 nd Principles. - Correct answers✔✔The point of application of a force
acting on a rigid body can be transferred to any other point on line of action of the force without
altering its effect.
3 rd principle of the statics
, (Parallelogram Law) - Correct answers✔✔Two forces applied at one point of a body have as
their resultant a force applied at the same point and represented by the diagonal of a
parallelogram constructed with the two given forces as its sides.
4th principle of statics
(Newton's 3rd law) - Correct answers✔✔To any action of one material body on another
there is always an equal and opposite reaction.
5th principle of statics
(Principle of Solidification) - Correct answers✔✔If a freely deformable body subjected to the
action of a force system is in equilibrium, the state of equilibrium will not be disturbed if the
body solidifies (becomes rigid).
Constraint body - Correct answers✔✔A body whose displacement in space is restricted by other
bodies, either connected to or in contact with it.
Smooth. Plane (Surface) or Support. - Correct answers✔✔A smooth surface is one whose
friction can be neglected in the first approximation. Therefore, the reaction N of a smooth surface
or support is directed normal to both contacting surfaces at their point of contact and is applied at
that point.
Direction of tension force - Correct answers✔✔The reaction T of the string is thus directed along
the string towards the point of suspension
Cylindrical Pin (Bearing) - Correct answers✔✔When two bodies are joined by means of a pin
passing through holes in them the connection is called a joint or hinge. In this case neither the
magnitude R nor the direction (angle a) of force R are immediately apparent.
