Sports speed teaching plan

How should teachers prepare teaching plans when teaching sports speed? The following are the fast and slow exercise lesson plans I shared with you, hoping to help you.

Quality education goal

1, knowledge and skills

The motion of an object can be described by speed.

Simple calculations can be made with the speed formula.

Know the concept of uniform linear motion.

Understand the concept of average speed.

2. Process and method

Experience the method of comparing the speed of objects and understand the practical significance of the concept of speed.

3. Emotions, attitudes and values

Feel the beauty of the combination of science and art.

Teaching focus

Physical meaning and speed formula of speed

Teaching difficulties

1, establish the concept of speed.

2. Stroboscopic photography to study the motion of objects.

teaching process

First, the introduction of new courses.

In real life, people are concerned about the speed of object movement. For example, in the sprint competition of track and field games, people are most concerned about who will win the championship; When people travel, they always want to choose convenient means of transportation and reach their destination as soon as possible; The military always wants missiles and combat planes to fly faster.

Question: How to describe the speed of an object?

Second, speed.

1, two methods to compare the speed of objects.

(1) In swimming competitions, spectators and referees compare the speed of swimmers in different ways.

Question: Please talk about it. How do spectators compare the speed of athletes? What method does the referee use to compare the swimming speed of athletes?

Students discuss and then answer.

(The audience's method is to see who swims at the front in the competition; The referee's method is to see who reaches the finish line first, which is very short. )

Induction: the audience's method is actually: at the same time, look at the length of the object's movement distance to compare the speed; In fact, the referee's method is: objects move the same distance, depending on the length of movement time.

(2) Student experiment: Compare the falling speed of paper. Experience two ways to compare the speed of an object.

Take two sheets of paper opened on 16, one folded once and the other folded twice. In order to make the paper fall smoothly, both ends of the paper can be folded upwards to release it from the same height at the same time.

(Guess): Which piece of paper falls fast?

(Try): Is the result consistent with your guess?

(Discussion): How to compare the speed of paper movement? Is there any other way to compare the speed of movement?

(3) Give another example for students to discuss: A classmate used 12s for the 100-meter, but the result of the 10,000-meter world champion was about 28 minutes. How to compare their speed?

Inspiration: There are two small balls with the same speed. One ball moves in a straight line for 30m, which takes1min. The other ball moves in a straight line for 40m, which takes 50 s. Figure 1 1-2- 1 shows the movement of two small balls in a certain period of time. The time and distance of the two balls are not equal. Can you tell which ball moves faster from the diagram 1 1-2- 1?

(As can be seen from the figure, in each 1, the distance traveled by two balls is long, so it can be determined that the second ball moves faster. )

Students are inspired: under the condition that the time of movement and the distance of travel are not equal, every object passes a long distance in the same time and moves very fast. In this way, the problem is transformed into a comparison under the condition of equal time.

2. Description of the velocity of an object in physics.

Based on the convention that people compare the speed of objects, in physics, speed is used to express the speed of objects. At the same time, the longer an object passes, the faster it will be. The shorter the time it takes for an object to move the same distance, the faster the speed. According to the previous calculation, the speed is equal to the distance traveled by a moving object in unit time, which can be expressed by the formula: v = s/t.

Introduce the meaning and unit of symbols in the formula;

S-distance meter (m)t- time second (s)v- speed meter per second (m/s or m.s- 1)

In the international system of units, the unit of speed is meters per second, and in transportation, kilometers per hour is also often used as a unit, and the symbol is km/h or km.h- 1. 1m/s = 3.6km/h 1km/h = 1/3.6m/s = 0.28m/s

3. Read the speed values of some objects given on page 23 of the text to understand the speed of some objects (indicating that the first cosmic speed is the speed that a spacecraft must have when it makes a circular motion along the earth's surface, also called hovering speed. )

4. Speed calculation

(1) Students read the example on page 23 of the text, understand the meaning of the question, and calculate the speed of athletes and motorcycles according to the speed formula.

(2) Students read the example on page 24 of the text and analyze the meaning of the question: beijing-shanghai railway line length and train running speed can be solved by formula v=s/t, and the formula v=s/t is deformed to get t=s/v, which is solved by data substitution.

Three. Stroboscopic photography-a method to study the motion of objects.

Fourth, uniform linear motion.

1, let the students read the content on page 25 of the text by themselves:

(1) What kind of motion of an object is called uniform linear motion?

(2) What kind of motion of an object is called variable speed motion?

(3) How to roughly describe the variable-speed motion of an object?

(The uniform motion of an object in a straight line is called uniform linear motion. Therefore, when an object moves in a straight line at a uniform speed, its speed should be a constant value, which has nothing to do with distance and time. Therefore, v=s/t cannot be understood as being directly proportional to s and inversely proportional to t ...)

2. On the basis of students' discussion, the teacher summarized:

Variable-speed motion can be calculated by v=s/t, where s is a certain distance that the object passes, t is the time that the object passes through this distance, and the obtained v is the average speed that the object passes through this distance.

3. Calculate the average speed in life

(1) Students try to explain the train timetable.

(2) According to the train schedule, inquire about the number of trains and running time from Xiangfan to Danjiang. Calculate the average speed of trains from Xiangfan to Danjiang.

(3) Check the train schedule and calculate the journey and running time of the train from Zhupo to Laohekou. Calculate the average train speed from Zhupo to Laohekou.

5. Guide students to read the Magnifier of Science World Time after class.

Compliance self-inspection

1, speed is used to represent the physical quantity of an object.

2. An object moving in a straight line at a uniform speed passes through 1 20 meters in1minute, and its speed is m/s, and its physical meaning is.

3. If an object moving in a straight line at a uniform speed travels 20m in 4s, its speed in the first 2s must be ().

A, 80m/s B, 10 m/s C, 5 m/s D, unable to judge.

4, good at uniform linear motion speed formula v=s/t, the following statement is correct ()

A, the greater the speed v of an object, the longer the distance s.

B, the faster the object moves, the less time it takes.

C, the speed of the object movement is proportional to the distance, and inversely proportional to the time.

D the object v is determined by s/t, but it has nothing to do with the size of s and t.

5, the following speed, in order of size is ()

(1) The speed of the running train is 72km/h (2) The speed of the speeding car on the expressway is 1.8km/min (3) The speed of the cheetah running on the grassland is 28 m/s.

a 、( 1)2)3)B 、( 3)2) 1)C 、( 2)3) 1)D 、( 1)3)2)

6. Cars driving on a straight road will pass 80km within 1h, 80km in the second hour and 80km in the third hour. Xiaohua said that the car must be moving in a straight line at a constant speed in these three hours, while Xiaoming thought that the car was not necessarily moving in a straight line at a constant speed in these three hours. Which of them is right? Talk about your opinion.

Improve ability

Xiao Ming and his father travel by train. In order to measure the average speed of the train, the following methods are adopted: counting from the first collision between the wheel and the rail, and the result is that 25 collisions are heard within 1min. Dad told Xiaoming that each rail is 25 meters long, so what is the speed of the train during this time?

8. When an object moves in a straight line at a uniform speed, the distance passed by the first 5s is 10 m, the distance passed by the last 5s is 25m, and the distance passed by the last 5s is 16m.

(1) Find the average speed of the first 5s, the last 5s and the whole journey respectively.

(2) Through your calculation results, explain why you need to specify the time or distance when talking about the average speed.