Analyze the spring force problem?pogopin Vendor

　　Analyze the spring force problem?

　　—, the direction of spring force

　　The spring is similar to the movable rod in the direction of elastic force, which can be stretched and compressed, and the direction of elastic force is opposite to the direction of spring deformation.

　　Second, the size of the spring force

　　Compared with the rod and rope, the spring force is the most special. It is so special that the formula can be used to calculate the spring force. The formula is F=R (g does not mean that rods and ropes cannot be calculated by this formula. The rope has no deformation, and the calculation does not involve this formula; ②X in this formula refers to the shape variable.

　　Therefore, to deal with the problem of the size of the spring force, it is only necessary to find the deformation of the spring.

　　The magnitude and direction of the spring force are relatively simple. We will focus on the third feature of the spring:

　　Third, the spring elasticity change problem

　　It can be seen from (2) that when K is constant, the spring force F is proportional to the deformation amount X. As shown in Figure 3, at the moment when the external force is just removed, the spring has no time to contract, and the spring's deformation is too late to change.

　　The deformation of the spring remains unchanged, so the elastic force of the spring remains unchanged. In other words, when the external force is removed, the elastic force of the spring remains unchanged.

　　In order to facilitate understanding, let's look at two sample questions.

　　To deal with this kind of problem, you only need to grasp'the moment the external force is removed, the spring force will not change'. That is to say, at the moment the external force is removed, the elastic force of the spring remains unchanged in the force analysis, and the pulling force of the rope disappears. After solving the resultant force on the object, the acceleration of the ball can be obtained. Therefore:

　　For a small ball, the resultant force is 5MG, and the direction is vertical upward; the acceleration of the small ball is 5G, and the direction is vertical upward;

　　In the same way, the acceleration of the 2 ball is 2.5G, and the direction is vertical downward; the acceleration of the 3 ball is 0.

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