What does a free-body diagram show?
A Forces acting on a body
B Energy in a system
C Internal forces
D Displacement of an object
Which of the following is a scalar quantity?
A Force
B Velocity
C Distance
D Acceleration
What is the unit of force in SI units?
A Watt
B Newton
C Pascal
D Joule
What does equilibrium mean in mechanics?
A Object moves at constant speed
B Forces are zero
C Forces act in the same direction
D Forces balance each other
What is the formula for momentum?
A Mass × Velocity
B Force × Time
C Mass × Acceleration
D Force × Distance
Which principle calculates unknown forces in equilibrium?
A Impulse-momentum theorem
B Virtual work principle
C Energy conservation
D Conservation of mass
What does kinematics study?
A Energy conservation
B Forces and motion
C Motion without considering forces
D Work and energy
What does the modulus of elasticity measure?
A Material hardness
B Stress at failure
C The bending of materials
D Deformation under stress
What is the mechanical advantage of a simple machine?
A The ratio of output force to input force
B The total work done by the machine
C The displacement of the load
D The effort required to move a load
What does the term “stress” refer to in material mechanics?
A The material’s elasticity
B The force per unit area
C The strain produced in a material
D The material’s resistance to heat
What is the role of a truss in construction?
A To resist torsion
B To support compressive forces only
C To carry axial loads
D To resist bending
Which of the following is a non-contact force?
A Tension
B Friction
C Normal force
D Gravitational force
What does the moment of inertia represent in rotational motion?
A The resistance to angular acceleration
B The force required to rotate
C The applied torque
D The speed of rotation
What is the effect of friction on motion?
A It causes constant motion
B It reduces acceleration
C It reduces displacement
D It increases velocity
What is the formula for calculating work done by a force?
A Force × Time
B Mass × Acceleration
C Force × Distance
D Force / Distance