Теориялық механика бойынша тест

What is the axiom about the addition and removal of a balanced force system?

• The effect of a given force system on a body does not change if a balanced force system is added or removed.

• If a balancing system is added or removed to a rigid body under the influence of some force system, then the rigid body will exit the state of rest and move uniformly and rectilinearly.

• If a balancing system is added or removed to a rigid body under the influence of some force system, then the rigid body is called free.

• If a balancing force system is applied to a rigid body under the influence of some force system, then the external and internal forces in the given system will be equivalent.

• If a balancing force system is applied to a rigid body under the influence of some force system or if this force system is removed, then any force can be moved along the line of action of the force.

What is a material point in mechanics?

• Any material body that retains its dimensions according to the conditions of the given task.

• A geometric body with weight.

• A material body with very small dimensions.

• A material body that retains its weight according to the conditions of the given task.

• A material body whose dimensions remain unchanged.

What is the definition of a solid body?

• A body whose distance between any two points remains unchanged.

• A solid body that changes very little in size.

• A body whose shape changes very little, while the distance between points remains the same.

• A body whose distance between points changes slightly, while the shape of the body remains the same.

• None of the above answers are correct.

What is a uniform force system?

• A force that balances the vector sum of all forces in the given system.

• A force that is equivalent to the given force system.

• A force that is equal to the given force system.

• A force module that is equal to the sum module of the given system.

• A force that balances the remaining force sum from this force system.

What do we call the algebraic moment of force with respect to the center?

• A scalar quantity with the corresponding sign of the product of the force module and the lever arm.

• The product of the force and the cosine of the angle between the radius vector and the force.

• The product of the force and the lever arm.

• The product of the force and the radius vector to the center.

• The product of the force and the distance from the point to the center.

Find the definition of the Varignon theorem:

Find the definition of the Varignon theorem:

• If the resultant of a given force system is a balance, then the moment of this balance with respect to any center is equal to the sum of the moments of all forces of this system with respect to that center.

• It is possible to transfer any plane parallel to this plane without changing the motion of the body affected by the given pair.

• For the equilibrium of parallel forces not lying in the same plane, the sum of the projections with respect to the axis must be equal to zero, and the sum of the moments must also be equal to zero for each of the two coordinate axes.

• The sum of the two resultant moments is equal to the force module, and any point lying on a straight line with opposite directions is equal to zero.

• The maximum value of the friction force is proportional to one body at rest to the next body and the normal reaction.

How is the axiom of static equilibrium of two forces read?

• If two forces act on an absolutely free rigid body and these forces are always equal in magnitude and directed towards opposite sides along the same straight line, then the body can be in a state of equilibrium.

• If the lines of action of all forces intersect at one point, then the body can be in equilibrium.

• If the sum of the moments of the forces with respect to the center is equal to zero, then the body is in a state of rest.

• If the equilibrium system of forces is combined or destroyed, then the system of forces does not change its effect on the body.

• The sum of the forces is equal to the geometric sum of the forces acting on the body.

What is meant by the equilibrium system of forces in theoretical mechanics?

• If the polygons of the forces are closed.

• The geometric sum of the forces acting on the body.

• The parallel lines of force actions.

• There is no correct answer.

• The moment of forces with respect to the axis is equal to zero.

Under what condition can a constrained body be considered free?

• If the constraints are removed and their effects are replaced by reactions.

• When the considered deformed body is fully hardened.

• If the existing constraints are removed and replaced by active forces.

• If the constraints that prevent the given constrained body from moving in any direction in space are removed.

• If all active forces applied to the body are replaced by the reactions of all constraints.