Qi Yuxia (Lanzhou Qiubei Middle School, Lanzhou 730070) For example, one end of a lightweight spring is tied to the O point on the ceiling, and the other end is a mass of M. The block is stationary on the horizontal plane. There is a nail at A, and the length of 04 is exactly the same as the original length of the spring.
A horizontally right constant force F is now used to slowly pull the mass from the b position to the r position.
Then, the change of the support force N of the object by the ground is () IV becomes small and cannot be determined as the analysis of the force analysis of the object. Such as.
C position: mg can not be directly determined / '* (9 how to change. May wish to change the idea. Write *0 々. Z. Further writing is * obviously equal. r. such as. Therefore, = /, combined above. Decomposition When the spring is elastic. *Because /= is a variable, it is completely possible to determine the component of the elastic force from the perspective of "decomposing" the shape variable. It is often possible to receive unexpected effects.
Finding the solution to the problem from the laws of physics. Xing Xingming (Hebeikoukou City, a high 46fiOOO) solution physics problem is to find the internal relationship of physical quantities in the physical process according to the physical situation of the topic and the known conditions. Use physical laws and scientific methods to find the amount to be sought. Therefore, the solution to the problem can be found in the physical law, and the problem-solving ideas are drawn from the research object, the establishment condition, the function expression, the scope of application and the analysis of the physical law.
Taking Newton's second law as an example, Newton's second law reflects the relationship between force and motion. When applying Newton's second law, it is first necessary to clarify the object of study. This is clear, and the w in the formula = is determined. In the second step, it is the key to analyze the force analysis and the motion state of the research object. If you need this item, you need to determine the acceleration a, and the analysis of the force and the analysis of the motion state are closely related. The third step, according to = grab 2 column equation, then. That is to pay attention to the vector property of =ww, if necessary, to list the equations in the direction of two decompositions, and pay attention to its transientity, that is, the same as a, the same body, the same direction as a, which is the core of the problem solving. The fourth step is to solve the equation to get the answer.
As shown in the figure, on a smooth slope with an inclination of 30*, a light spring is used to connect an object of mass w=lkg. When the carriage accelerates with the acceleration a right, the object and the trolley remain relatively stationary, and the spring force of the spring is sought. How much, like, and force. Considering the acceleration a along the horizontal direction, the coordinate system is established as shown. From Newton's second law:
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