Here are some references.
Monday, June 9th, sunny to cloudy.
After school in the afternoon, the class teacher gave us an assignment, asking everyone to find a way to measure the volume of disposable chopsticks and record the measurement process in the form of math diary. On the surface, this homework is a mathematical practice activity, but in fact it may have a deeper meaning, because the use of disposable chopsticks is related to environmental protection.
As soon as I got home, I sat quietly at my desk and thought about this problem. Disposable chopsticks are irregular three-dimensional figures. How can I calculate its volume? I thought about it, scratching my head for a while, shaking my head for a while ... finally, I got a clue. I can put disposable chopsticks in a container full of water, so that the water in the container will overflow. Isn't the amount of splashing water as big as chopsticks? But chopsticks are lighter than water and will float on the water. What shall we do? Can you fix chopsticks with stones or tape or something? I think it should be possible, but these methods are too troublesome to measure. If only there were a simpler way! After thinking hard, I finally smiled proudly.
June 10 will be fine on Tuesday.
I went to the restaurant to buy a box lunch at noon today, and specially asked for several pairs of disposable chopsticks for the experiment.
When I got home, I was really excited at the thought of doing the experiment, but it was also mixed with some panic. I don't want the first plan to be eliminated as soon as it comes out. In order to verify the correctness of the experimental scheme, I specially measured the length (20cm), thickness (0.35cm) and width (1.6cm and 0.8cm respectively) at both ends of chopsticks. Because disposable chopsticks are similar to trapezoid. I use trapezoidal volume formula to calculate the volume of chopsticks. According to the calculation results, the volume of disposable chopsticks is about 8.4 cubic centimeters. If the result measured in the experiment is similar to that calculated by me, then my experiment is successful, otherwise, I have to find another way. I was just about to start the experiment, but I saw that the experimental equipment was not enough. I have to wait until tomorrow.
June 1 1 Wednesday is fine.
The moment of hope has finally arrived. I trotted home after school and put down my schoolbag. I can't wait to pick up the beaker my father borrowed from the company. After being filled with water, I carefully put the beaker into the basin to ensure that the water in the beaker did not leak. Then, I carved a mark on the chopsticks with a knife and divided it into two parts. This mark is the dividing line between the two parts of chopsticks. I want to measure the chopsticks twice.
The experiment began, and my hands holding chopsticks trembled from time to time, but I tried to restrain this excitement. I slowly put the chopsticks into the beaker and try not to shake them, otherwise too much water will overflow and the measurement results will be inaccurate. When I first inserted a part of chopsticks into the beaker, I saw some water in the beaker overflow into the basin. After the beaker is filled with water, I put another pair of chopsticks in the beaker.
As a result, I failed. The size of chopsticks measured in the experiment is only 3 cubic centimeters, which is far from the size I calculated. At first, I still didn't believe it. After repeated thinking, I finally understood the reason for my failure. It turns out that the diameter of the beaker is too large, even if the beaker is not filled with water, human vision will think it is full. In addition, the size of chopsticks is too small and the scale of beaker is too large, which leads to the deviation of experimental results. Therefore, I
June 12 Thursday is fine.
Since the first experiment failed, I have been trying to improve it, but I just can't think of a simple and feasible way. At noon that day, mom and dad didn't cook, so we decided to eat out.
After ordering in the restaurant, my mother specially ordered a glass of juice in order not to disturb me. As soon as the juice came, I took a few swigs. My mother told me to drink less juice for fear that I would lose my appetite after eating. Before the dish came up, I felt that I had nothing to do, so I thought of blowing bubbles, so I picked up the straw in the juice bottle and blew a few breaths on the water, and several bubbles appeared on the water.
It will be fine on Friday, June 13.
At noon today, in order to measure the size of chopsticks more accurately, I asked my father to bring a slender measuring cylinder from the chemistry room. The scale unit is smaller, and each unit is only 1 cubic centimeter. At this moment, I seem to feel victory beckoning to me. I really have everything except hands-on experiments.
First of all, I drew a dividing line on disposable chopsticks with a pencil, divided the chopsticks into two sections evenly and soaked them in water to prevent them from being washed by water during measurement. Then, I inserted the chopsticks into the measuring cylinder, and dripped water into the measuring cylinder with a dropper, so that the water in the measuring cylinder rose to the dividing line of the chopsticks. After writing down the water level scale (38 ml) in the measuring cylinder, I took the chopsticks out of the measuring cylinder and wrote down the water level scale in the measuring cylinder. The difference between the two water level gauges is the volume of this part of chopsticks, which is 3.5 cubic centimeters. In the same way, I measured the volume of the other part of the chopsticks to be 5 cubic centimeters, and the two measurement results added up to get the volume of this pair of chopsticks to be 8.5 cubic centimeters. When I got the result, I cried excitedly. How proud I am at this time!
Then I calculated the annual consumption of disposable chopsticks in our school (1500 people) and the whole country (1200 million people), which are 13.96 cubic meters and1/69000 cubic meters respectively. The result surprised me. I hereby appeal to the students at school, no! It is the people of the whole country, and it is not! Everyone in the world should stop using disposable chopsticks. Only in this way can we protect our forest resources, make our earth environment better and let everyone on the earth breathe clean and fresh air.