Engineering Mechanics Quiz

What does Newton's First Law state?

• Every body continues in its state of rest or uniform motion unless acted upon by an external force.

• The rate of change of momentum is directly proportional to the impressed force.

• For every action, there is an equal and opposite reaction.

• A particle acted upon by three forces remains in equilibrium.

What is the principle of transmissibility?

• The state of rest or motion of a rigid body is unaltered if a force is replaced by another force of the same magnitude.

• The moment of inertia is the minimum moment of inertia for an axis in that direction.

• The moment of a force about a point is equal to the sum of the moments of the various forces.

• The resultant of two forces is represented by the closing side of a triangle.

According to Lami's theorem, what is true about three forces acting on a particle?

• Each force bears the same proportionality with the sine of the angle between the other two forces.

• The forces must be equal in magnitude.

• The forces must act in the same direction.

• The resultant force must be zero.

What does the Parallelogram Law state?

• The forces must be equal in magnitude.

• The state of rest or motion of a rigid body is unaltered if a force is replaced by another force.

• The resultant of two forces acting at a point is represented by the diagonal of a parallelogram.

• The moment of a force about a point is equal to the sum of the moments of the various forces.

What is the formula for the maximum frictional force?

• F_m = μ • N

• F = m • a

• F = m • g

• F = 1/2 m • v^2

What is the moment of a force about a point?

• It is the distance from the point to the line of action of the force.

• It measures the tendency of the force to cause rotation about that point.

• It is the product of mass and acceleration.

• It is the sum of all forces acting on a body.

What does the Parallel Axis Theorem state?

• The moment of inertia about an axis through its center of mass is the minimum moment of inertia.

• The moment of inertia is always constant.

• The moment of inertia is independent of the shape of the object.

• The moment of inertia about any axis parallel to the axis through the center of mass is greater.

What is the definition of a couple in mechanics?

• A single force acting on a body.

• Two forces acting in the same direction.

• Two parallel forces that have the same magnitude and opposite directions.

• A force that causes a body to rotate.

What is the relationship between work and energy?

• Work and energy are independent of each other.

• Energy cannot be converted into work.

• The work done on an object is equal to the change in its kinetic energy.

• Work is always negative.

What does the law of Coulomb friction state?

• The magnitude of kinetic friction is independent of the velocity of the sliding surfaces.

• Friction is always proportional to the area of contact.

• Static friction is always greater than kinetic friction.

• Friction depends only on the weight of the object.