Cơ học kỹ thuật Quiz

What is the equilibrium system of forces?

• The equivalent system of forces is equal to each other.

• The forces of the system are opposite to each other.

• The main vector of the system of forces is zero.

When are two systems of forces called equivalent?

• They have the same mechanical effect on a rigid body.

• They have equal values.

• They act along the same line.

• They make the rigid body balanced.

What is the resultant of a system of forces?

• A single force equivalent to the given system of forces.

• A system consisting of two balanced forces.

• A couple of forces.

• A force and a couple.

The effect of a force on a rigid body remains unchanged if:

• We slide along the line of action of it.

• We add a force directly opposite to the given force.

• We add a couple.

• We move the given force parallel to another point.

What is a constraint?

• Conditions that hinder the motion of a body.

• Relative motion between two contacting bodies.

• The clamping of a body by a fixture.

• The ropes suspending the body.

What is the reaction of a constraint?

• Uniformly distributed force.

• Concentrated force.

• First-degree distributed force.

• Second-degree distributed force.

In the figure, what type of force acts on segment AC?

• Bending force.

• First-degree distributed force.

• Concentrated force.

• Uniformly distributed force.

In the figure, what type of force acts on segment CB?

• Fixed support.

• Movable support.

• Clamp.

• Support.

In the figure, what type of connection is at E?

• Fixed support

• Hinge

• Roller

• None

What is the direction of the reaction force on beam CD?

• Upward

• Downward

• Left

• Right