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Initiation to mechanic

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Chapter 1 - Quiz

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1. What is the correct definition of a force?
A scalar quantity acting only on stationary objects. A vector quantity capable of producing or modifying the motion of a body. A force that always results in deformation. A force that acts independently of its point of application.
2. The main characteristics of a force vector are:
Direction, sense, energy, and density. Point of application, direction, energy, and duration. Point of application, direction, sense, and magnitude. Mass, velocity, acceleration, and force.
3. The moment of a force is defined as:
The product of mass and acceleration. The product of the force and its perpendicular distance to the point of action. The sum of the forces acting on an object. The potential energy of an object.
4. Newton's third law states that:
The sum of the forces is zero in all cases. An action force is opposed by an equal reaction force. Objects never undergo acceleration. A force acts without external influence.
5. In a system in static equilibrium:
The sum of the moments is maximum. The center of gravity is always at the geometric center. The sum of the forces and the sum of the moments are zero. The body undergoes constant acceleration.
6. Two forces F1 = 10 N and F2 = 15 N act on a body in the same direction. What is the magnitude of the resultant force?
5 N 10 N 25 N 15 N
7. An object with a mass of 2 kg undergoes an acceleration of 3 m/s². What is the force exerted on this object?
2 N 6 N 9 N 1.5 N
8. A cart is pulled by a force of 50 N on a flat surface, with a friction force Ff = 10 N. What is the net force exerted?
40 N 60 N 10 N 50 N
9. If an object is in equilibrium under three forces, the vector sum of these forces is:
Equal to their product. Equal to zero. Equal to the mass of the object. Impossible to determine without additional data.
10. A 6 m beam is supported by two supports (A and B). A weight of 300 N is suspended 2 m from A. What is the reaction at support A?
100 N 200 N 150 N 300 N