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"Speed of Movement" Mechanical Movement PPT Courseware 2
Two ways to compare the speed of exercise:
1. When the distance is the same, the length of time it takes; (the shorter time is ____)
2. When the time is the same, look at the distance. (If the distance is long, ____)
3. New question: If the distances are different and the time is different, how to compare the speed of movement?
For example: Xiao Cong’s 100m running time is 17s, and Xiaoming’s 50m running time is 8s. Which one of them is faster? (Can it be directly compared?)
The speed of the car is "33m/s", pronounced as: 33 meters per second
Its physical meaning:
The distance a car covers in 1 second is 33 meters.
The speed of the airplane is "700m/s", pronounced as: 700 meters per second,
Its physical meaning is:
The distance traveled by the airplane in 1 second is 700 meters.
The motion of an object along a straight line with a constant speed (fast or slow) is called uniform linear motion.
(Uniform linear motion is the simplest mechanical motion)
Movement in which the speed of an object changes is called variable speed movement.
(The sports we see in daily life are basically variable speed sports.)
When an object moves at variable speeds, its speed is sometimes fast and sometimes slow. How to describe its movement?
Average speed:
In variable speed motion, the speed obtained by dividing the total distance by the total time is called the average speed.
think about it
A car driving on a straight road covers a distance of 80km in the first hour, a distance of 80km in the second hour, and a distance of 80km in the third hour. Xiaohua said that the car traveled within these three hours. It must move in a straight line at a uniform speed. Xiao Ming thinks that the car may not move in a straight line at a uniform speed during these 3 hours. Which one of them is right? Talk about your opinions.
Xiao Ming is right. Although 80km is passed every hour, the distance covered in each minute of each hour can be different. That is to say, the first ten minutes can be faster, and the last twenty or thirty minutes can be faster. Slow down, and you can pass 80km in one hour.
Classroom training
1. Speed is a physical quantity used to express the _______ of an object.
2. An object moving in a straight line at a uniform speed covers a distance of 120m in 1 minute. Its speed is ______m/s, and its physical meaning is ______.
3. An object moving in a straight line at a uniform speed travels 20m in 4 seconds, so its speed in the first 2 seconds must be ( )
A.80m/s B.10 m/s
C.5 m/s D.Unable to determine
4. For the speed formula v=s/t of uniform linear motion, which of the following statements is correct ( )
A. The greater the speed v of the object, the longer the distance s traveled.
B. The greater the speed v of the object, the less time t it takes
C. The speed of an object’s movement is directly proportional to the distance and inversely proportional to time.
D. The object v is determined by s/t, but has nothing to do with the size of s and t.
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