Engineering Mechanics Exam
Q&A|Statics, Dynamics, Structural
Analysis, Stress & Strain Study
Guide,2026 Updated.
What is engineering mechanics defined as?
- CORRECT ANSWER -The science which considers the effect of forces on rigid
bodies.
What does statics deal with?
- CORRECT ANSWER -The effects of forces on rigid bodies which remain at rest.
What do dynamics consider?
- CORRECT ANSWER -The effects of forces on rigid bodies that are in motion.
What is a force system? -
CORRECT ANSWER -Any arrangement where two or more forces act on a body.
What are coplanar forces? -
CORRECT ANSWER -Forces whose lines of action lie on the same plane.
What are collinear forces? -
CORRECT ANSWER -Forces whose lines of action lie on the same line.
What is the principle of transmissibility of a force? -
CORRECT ANSWER -The external effect of a force on a body is the same for all
points of application along its line of action.
What is the moment of a force? -
CORRECT ANSWER -The measure of its ability to produce turning or twisting about
an axis.
How is the moment of a force mathematically expressed? -
CORRECT ANSWER -M = F · d, where F is the force and d is the moment arm.
What is Varignon's principle of moments? -
CORRECT ANSWER -The algebraic sum of the moments of all forces about any
point is equal to the moment of their resultant force about the same point.
,What are the conditions for equilibrium in mechanics?
- CORRECT ANSWER -Σx = 0, Σy = 0, ΣM = 0.
What is a couple in mechanics? -
CORRECT ANSWER -Two equal and unlike parallel forces acting in opposite
directions.
What is the method of joints in truss analysis? -
CORRECT ANSWER -A method where the forces in members are determined by
analyzing the equilibrium of joints.
What are the assumptions in truss analysis? -
CORRECT ANSWER -Weights of members are neglected, all connections are
smooth pins, and all external loads are applied directly to the pins.
What is friction? -
CORRECT ANSWER -The opposing force that acts in the opposite direction of the
movement of a body.
What is the coefficient of friction (μ)? -
CORRECT ANSWER -A value that represents the ratio of the frictional force to the
normal force.
What happens to the frictional force as the applied force increases? -
CORRECT ANSWER -The frictional force increases until it reaches its maximum
value when motion is impending.
What is the significance of a free-body diagram? -
CORRECT ANSWER -It is the most important single step in the solution of problems
in mechanics, used to account for all forces acting on a body.
What is the method of sections in frame analysis? -
CORRECT ANSWER -A method that allows direct determination of forces in any
member of a structure by cutting through it.
What does the analysis of structures involve? -
CORRECT ANSWER -Determining how loads applied to a structure are distributed
throughout the structure.
What is the significance of support reactions? -
CORRECT ANSWER -They are necessary to maintain equilibrium in structures and
are determined first in analysis.
What is the role of equilibrium in mechanics? -
, CORRECT ANSWER -It designates the condition where the resultant of a system of
forces is zero.
What is the difference between tension and compression in trusses? -
CORRECT ANSWER -Tension is the force that pulls members apart, while
compression is the force that pushes members together.
What is the relationship between friction and normal force? -
CORRECT ANSWER -Friction force is proportional to the normal force.
What does the equation ΣF = 0 represent? -
CORRECT ANSWER -It represents the condition for equilibrium where the sum of all
forces acting on a body is zero.
What is the significance of the angle of forces in mechanics? -
CORRECT ANSWER -The angle is always measured from the positive x-axis and
affects the components of the forces.
What is the purpose of the method of members in frame analysis? -
CORRECT ANSWER -To solve for the forces in each member of a frame structure
by applying equilibrium conditions.
What does the term 'moment arm' refer to? -
CORRECT ANSWER -The perpendicular distance from the line of action of the force
to the axis of rotation.
What does friction always act to oppose? -
CORRECT ANSWER -The motion of the body.
What is the angle of friction? - CORRECT ANSWER -The angle between the total
reaction and its normal component when limiting friction is acting.
What is the difference between static and kinetic friction? -
CORRECT ANSWER -Static friction can vary from zero to a maximum value, while
kinetic friction is constant at its limiting value.
What is the purpose of wedges in mechanics? -
CORRECT ANSWER -Wedges are used for lifting heavy weights or making small
adjustments in the position of a body.
What happens to a body if the normal force acting on it is negative? -
CORRECT ANSWER -The body will not be in contact with the ground and will tip
over.
Q&A|Statics, Dynamics, Structural
Analysis, Stress & Strain Study
Guide,2026 Updated.
What is engineering mechanics defined as?
- CORRECT ANSWER -The science which considers the effect of forces on rigid
bodies.
What does statics deal with?
- CORRECT ANSWER -The effects of forces on rigid bodies which remain at rest.
What do dynamics consider?
- CORRECT ANSWER -The effects of forces on rigid bodies that are in motion.
What is a force system? -
CORRECT ANSWER -Any arrangement where two or more forces act on a body.
What are coplanar forces? -
CORRECT ANSWER -Forces whose lines of action lie on the same plane.
What are collinear forces? -
CORRECT ANSWER -Forces whose lines of action lie on the same line.
What is the principle of transmissibility of a force? -
CORRECT ANSWER -The external effect of a force on a body is the same for all
points of application along its line of action.
What is the moment of a force? -
CORRECT ANSWER -The measure of its ability to produce turning or twisting about
an axis.
How is the moment of a force mathematically expressed? -
CORRECT ANSWER -M = F · d, where F is the force and d is the moment arm.
What is Varignon's principle of moments? -
CORRECT ANSWER -The algebraic sum of the moments of all forces about any
point is equal to the moment of their resultant force about the same point.
,What are the conditions for equilibrium in mechanics?
- CORRECT ANSWER -Σx = 0, Σy = 0, ΣM = 0.
What is a couple in mechanics? -
CORRECT ANSWER -Two equal and unlike parallel forces acting in opposite
directions.
What is the method of joints in truss analysis? -
CORRECT ANSWER -A method where the forces in members are determined by
analyzing the equilibrium of joints.
What are the assumptions in truss analysis? -
CORRECT ANSWER -Weights of members are neglected, all connections are
smooth pins, and all external loads are applied directly to the pins.
What is friction? -
CORRECT ANSWER -The opposing force that acts in the opposite direction of the
movement of a body.
What is the coefficient of friction (μ)? -
CORRECT ANSWER -A value that represents the ratio of the frictional force to the
normal force.
What happens to the frictional force as the applied force increases? -
CORRECT ANSWER -The frictional force increases until it reaches its maximum
value when motion is impending.
What is the significance of a free-body diagram? -
CORRECT ANSWER -It is the most important single step in the solution of problems
in mechanics, used to account for all forces acting on a body.
What is the method of sections in frame analysis? -
CORRECT ANSWER -A method that allows direct determination of forces in any
member of a structure by cutting through it.
What does the analysis of structures involve? -
CORRECT ANSWER -Determining how loads applied to a structure are distributed
throughout the structure.
What is the significance of support reactions? -
CORRECT ANSWER -They are necessary to maintain equilibrium in structures and
are determined first in analysis.
What is the role of equilibrium in mechanics? -
, CORRECT ANSWER -It designates the condition where the resultant of a system of
forces is zero.
What is the difference between tension and compression in trusses? -
CORRECT ANSWER -Tension is the force that pulls members apart, while
compression is the force that pushes members together.
What is the relationship between friction and normal force? -
CORRECT ANSWER -Friction force is proportional to the normal force.
What does the equation ΣF = 0 represent? -
CORRECT ANSWER -It represents the condition for equilibrium where the sum of all
forces acting on a body is zero.
What is the significance of the angle of forces in mechanics? -
CORRECT ANSWER -The angle is always measured from the positive x-axis and
affects the components of the forces.
What is the purpose of the method of members in frame analysis? -
CORRECT ANSWER -To solve for the forces in each member of a frame structure
by applying equilibrium conditions.
What does the term 'moment arm' refer to? -
CORRECT ANSWER -The perpendicular distance from the line of action of the force
to the axis of rotation.
What does friction always act to oppose? -
CORRECT ANSWER -The motion of the body.
What is the angle of friction? - CORRECT ANSWER -The angle between the total
reaction and its normal component when limiting friction is acting.
What is the difference between static and kinetic friction? -
CORRECT ANSWER -Static friction can vary from zero to a maximum value, while
kinetic friction is constant at its limiting value.
What is the purpose of wedges in mechanics? -
CORRECT ANSWER -Wedges are used for lifting heavy weights or making small
adjustments in the position of a body.
What happens to a body if the normal force acting on it is negative? -
CORRECT ANSWER -The body will not be in contact with the ground and will tip
over.
