How to calculate the force direction of the rod to the wood bloc

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2. Because the ideal model of the rod in physics is not deformable, that is, it is very hard, so it can provide a lot of forces such as tension and elastic force. Unlike the rope, it can only provide tension, so it can be in any direction

3. If the rod is fixed, then it can. If it is not fixed and connected to the object, it should be along the rod

4. When there is no bending deformation, the force moves along the rod. Because there is no bending, it can be imagined that there is no net force on the side of the rod, so the force on the rod can only be along the rod. It is difficult to determine the direction of the elastic force of the rod, which can provide elastic force in any direction. The direction of the elastic force often needs to be analyzed in combination with Newton's second law or the state of equilibrium. There is a case that the elastic force must be along the rod: light rod (regardless of mass, of course, there is no gravity), when both ends can rotate freely (usually hinged), and only both ends are stressed and in equilibrium, At this time, the elastic force of the rod on both ends of the object must be along the direction of the rod. This kind of rod is called Erli bar building. If it is mainly for high school students, there is no need to tangle here. The requirements for this part of the college entrance examination are not high. First, it is difficult, and second, it is difficult to combine with other knowledge

5. In addition to the direction of the unexpected resultant force of the rod, the problem of the rod is generally considered in circles. According to other stress conditions, whether the rod is along the rod or not, if the rod and the object are in the same straight line, it is along the rod. At the same time, the problem of the rod is very complicated. You need to analyze the specific situation and draw the stress diagram well, First, draw other known forces clearly, and then infer them from the known forces. Generally, if the force of the rod to the object is along the rod, you can decompose the force into along the rod and perpendicular to the rod, which can simplify a lot. Do more questions, and you can find out what you have learned

6. Because the ideal model of rod in physics is not deformable, that is, it is very hard, so it can provide a lot of forces, such as tension and elastic force. Unlike rope, it can only provide tension, so it can be in any direction

7. Statics is the science of studying the equilibrium law of an object under the action of a force system

the distance between any two points in a rigid body always remains unchanged under the action of a force. This is the idealized model

force is the mechanical interaction between objects, which makes the mechanical motion state of objects change

force system a group of forces acting on an object

the equivalent force system is two force systems whose effect of one force system acting on an object is the same as that of another force system acting on the object

balanced force system a force system is equivalent to zero force system

three elements of force (effect) force size, force direction and force action point

1. Force analysis of objects

2. Equivalent replacement (or simplification) of force system if a complex force system can be replaced by a simple force system, it is called simplification of force system. If a force system is equivalent to a force, the force is called the resultant force of the force system

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axiom the summary of people's long-term accumulated experience in life and proction, which has been repeatedly tested in practice, is considered to be the most common and general law in line with the objective reality< The parallelogram rule of axiom 1 force can be combined into a resultant force by two forces acting on the same point of an object. The action point of the resultant force is also changing. The magnitude and direction of the resultant force are determined by the diagonal of the parallelogram formed by the two force sides. The resultant force vector is equal to the geometric sum of the two force vectors. It can also be called force triangle< In axiom 2, two forces acting on a rigid body are equal in magnitude, opposite in direction and acting on the same straight line< According to axiom 3, the principle of adding or subtracting equilibrium force system is equivalent to the action of the original force system on the rigid body

inference 1 the transmissibility of force the force acting on a point on the rigid body can move to any point in the rigid body along its action line without changing the effect of the force on the rigid body

inference 2 the intersection theorem of three balanced forces acts on three mutually balanced forces on a rigid body. If the action lines of two of the forces converge with a point, the three forces must be in the same plane, and the action lines of the third force pass through the intersection point< Axiom 4 the law of action and reaction the force and reaction always exist at the same time. The two forces are equal in magnitude and opposite in direction, acting on two interacting objects along the same straight line

8. Is it the direction of the elastic force on the rod? For example: when an object is stationary on an inclined rod, the direction of the elastic force on the rod is vertical (equal to the gravity, but opposite). The elastic force of the rod is not necessarily in the direction of the rod, which is different from that of the rope and spring. Therefore, when studying the elastic force direction of the object on the rod, we should analyze it according to the situation mentioned in the title In addition, it is very necessary to draw the force analysis diagram when studying the force on the object. The general method is to analyze the only unknown force according to the known force and the motion of the object (the direction of the elastic force can be obtained by this method)

9. The elastic force depends on the contact relationship between two objects. The elastic force is not necessarily perpendicular to one object, but it must be perpendicular to the elastic contact surface:
1. If the elastic force acts between two surfaces, the elastic force is perpendicular to two surfaces. For example, a piece of wood is placed on a slope
2. If the elastic force acts between the point and the surface, the elastic force is perpendicular to the surface. If the wooden pole leans against the wall, the two elastic forces are perpendicular to the wall
the elastic force direction of the object to the rod must be perpendicular to the rod. This sentence is not correct. It depends on the position relationship between the object and the rod.