"Average Speed ​​and Instantaneous Speed" Simple Movement of Matter PPT Courseware 3

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"Average Speed ​​and Instantaneous Speed" Simple Movement of Matter PPT Courseware 3

1. Knowledge review:

Teachers and friends check each other for 1 minute, and then the whole class communicates

1. There are two ways to compare the speed of an object’s movement: ___________ and ___________

2. In physics, __________________ is called speed.

3. Formula: ____________v represents speed, s represents distance, and t represents time.

4.Physical meaning: ______________

5. Unit:

5m/s=km/h

72km/h=m/s

6. Uniform linear motion: refers to _____________

How to compare their speed?

1 minute exchange between mentors and friends

Use the ratio of a certain distance traveled by a moving object to the corresponding total time to make an average, comprehensive, and overall comparison

1. 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

example

The T15 train travels from Beijing to Guangzhou. The travel time from Beijing to Zhengzhou is 6h22min and the journey is 689Km; the travel time from Zhengzhou to Wuchang is 5h23min and the journey is 536Km. Find the average time of the T15 train from Beijing to Zhengzhou and Wuchang What are the speeds?

practise:

The car stopped and drove to Xigucheng. It walked 12 Km in the first 0.5 hours, rested for 5 minutes in the middle, and walked 15 Km in the last 0.5 hours. What was the average speed of the car during the whole journey, Km/h? What was the average speed in the first 0.5 hours? Average speed after 0.5 hours?

2. Instantaneous speed

1. Refers to the speed of a moving object at ______________

2. For an object moving in a straight line at a uniform speed, the average speed of the entire process is equal to the instantaneous speed of ________.

Determine which of the following refers to instantaneous speed

1. The speed displayed by the car speedometer;

2. The speed of the car when it passes a certain electric pole;

3. Speed ​​at the end of the 5th second;

4. The operating speed of my country’s high-speed EMUs is about 90 m/s

5. The speed of a supersonic fighter is 700 m/s

6. The walking speed of adults is about 1.5m/s

7. You ride faster than a pedestrian

8. The speed of the aircraft when taking off

9. Athletes’ finishing sprint speed

Thinking questions

A car drives from point A to point B on a straight road. The speed in the first half of the journey is 10m/s and the speed in the second half of the journey is 15m/s. Then the average speed of the car during the entire journey is What is the speed in m/s?

Four summary

1. Knowledge:

2. Teachers and friends’ mutual help experience:

3. Gold Medal Partner:

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"Average Speed ​​and Instantaneous Speed" Simple Movement of Matter PPT Courseware 4:

"Average Speed ​​and Instantaneous Speed" Simple Movement of Matter PPT Courseware 4 1. Variable speed linear motion Definition: An object moves in a straight line, if the displacement is not equal in equal time. This kind of motion is called variable speed linear motion. Understanding: 1) It does not have to be at any equal time...

"Average Speed ​​and Instantaneous Speed" Simple Movement of Matter PPT Courseware 2:

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Update Time: 2024-10-19

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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