Time flies, time flies. In a blink of an eye, the unit "Fun in Mathematics" is over, followed by "Percent Application". After learning this unit, we will be in a tense review state, followed by the scary final exam ... The unit of "Fun in Mathematics" has a lesson of "Rebound Height", which is mainly for us to do experiments ourselves, so Teacher Yang asked us to bring our own tools and start doing experiments on Thursday morning.
The main purpose of our experiment is to know which one plays basketball or table tennis higher. What factors are involved?
Our group is going to let basketball and table tennis fall freely, with a height of one meter. By analogy, we did five experiments each.
After the discussion of four people in the group, we came to the following conclusion:
1. The rebounding height of basketball and table tennis is influenced by geology. The higher you play in a hard place, the lower you play in a soft place on the ground, and you will hardly rebound in the sand.
Another factor is that basketball is full of gas. If it is too full, it will rebound very high. If you are short of gas, you will rebound and short. It's best to cheer up moderately, otherwise there will be unnecessary trouble and some fairness.
3. It may be that the material of the ball is different. Basketball is soft, table tennis is hard. Basketball may often be flat, while table tennis will always be so full of air unless there is a hole. And air flow. We all know that airflow can form wind. Maybe we think it is in free fall, but there may be an east wind to help it give it some strength!
4. Height and strength. These two factors will not exist, because both balls are in free fall, and we will not add any force. And the falling height is one meter, which is fair.
The average rebound height of basketball is 52.4CM, and the average data of table tennis is 23.2CM, so the rebound height of basketball is higher and table tennis is lower.
6. At the same height, what is the rebound height of basketball? What about table tennis? Our group used the average score of five experiments to take off the ball. For the convenience of calculation, we round 52.4CM to 52CM, that is, 52 ÷100 = 25/13; Table tennis is about 23CM, so: 23÷ 100= 100/23.
7. In the activity, we consolidated the knowledge we learned before, but sometimes table tennis bounces faster than basketball, so we often can't see what its rebound scale is, and it may take 2-4 times to record it.
During the activity, we learned a lot: the most important thing for a team is not to engage in infighting, but to cooperate sincerely. Review the past and gain new knowledge. Learning new knowledge must be based on a solid foundation. We should respect science, facts speak louder than words, and everything should be scientific. You can't talk nonsense, let alone make it up! There is mathematics everywhere in life. Mathematics is not only as complicated as addition, subtraction, multiplication and division, but also very interesting. As long as you study hard and like it, you will learn it well!