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Authoritative PPT Summary
"Average Speed and Instantaneous Speed" Simple Movement of Matter PPT Courseware 2
Look at pictures and analyze problems
What kind of sports do athletes and swimmers in the 100-meter race do? How to compare their speed?
Summarize:
Variable speed motion is more complicated than uniform speed motion. When it is not required to be precise and only a rough study is done, its speed can also be calculated using v=s/t. However, the speed v obtained at this time represents the average speed of the object passing through the road s, and should be called the average speed.
1. Concept
1. Average speed: the speed of a moving object within a certain distance (or a certain period of time).
2. Instantaneous speed: the speed of a moving object at a certain instant.
2. Calculation
Formula: v=s/t
average speed
1. Average speed: the speed of a moving object within a certain distance (or a certain period of time).
2. Formula: v=s/t
Note: When calculating, please note that s is the entire distance traveled by the object, and t is the time it takes to travel the entire distance. The average speed calculated represents the average speed of the object passing through this section of the route, and cannot represent any section of the route, or any section of the movement. situation within time. (Be sure to indicate which journey or time period it is)
Example 1: Ask the students to read page 69 of the book.
Example 2: A car moving in a straight line covers a distance of 100m in the first 10 seconds, a distance of 240m in 20 seconds, and a distance of 390m in 30 seconds.
Find (1) the average speed of the car in the first 20 seconds.
(2) The average speed of the car during the second 10 seconds.
(3) The average speed of the car within 30 seconds.
In traffic management, the police need to determine whether drivers are speeding; in weapons testing, they need to measure the speed of bullets or shells exiting the muzzle or muzzle of the gun to check whether the weapon is qualified. The speed measured in these cases is the speed of the object over a very short period of time.
2. Summary: The difference and connection between average speed and instantaneous speed
1. The average speed corresponds to the distance or time, and the instantaneous speed corresponds to the position or time;
2. For an object moving in a straight line with uniform speed, the average speed is equal to the instantaneous speed.
practise
1. What is the significance of the speed of some objects given in the figure below?
The speed of a speed fighter can reach 700 m/s, which means the instantaneous speed
The speed of a high-speed car can reach 30 m/s, which represents the instantaneous speed
The cruising speed of a large passenger aircraft is approximately 250 m/s, which represents the average speed
The operating speed of my country's high-speed EMUs is about 90 m/s, which means the average speed
2. In the story "The Tortoise and the Hare", it is said that the tortoise beat the hare, which refers to the tortoise's ____ speed; and at the beginning of their race, it is said that the hare ran really fast, which refers to the rabbit's ____ high speed.
Operation
Check the long-distance train timetable and find out how many trains there are from Xinxiang to Beijing? What time does each train depart? What time will you arrive at the station? How long will it be shared? Calculate the average speed for the entire journey.
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"Average Speed and Instantaneous Speed" Simple Movement of Matter PPT Courseware 3:
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