"Scientific Inquiry: Changes in Speed" The World of Movement PPT Courseware

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"Scientific Inquiry: Changes in Speed" The World of Movement PPT Courseware

Read the 29 pages of the textbook

How can we prove that Nannan’s running speed changes?

Usually to verify whether a point of view is correct, you need to find evidence to prove it.

How to collect evidence

1. Relevant scientific information can be found from public information sources through investigation and research.

2. Collect data through experiments

The following is research information from the Internet on the 100-meter run of "World Flying Man" Beijing Olympic sprint champion Usain Bolt:

The time taken for every 10 meters from the starting point is:

1.82s, 1.06s, 0.90s, 0.88s, 0.83s, 0.83s, 0.83s, 0.82s. The last 20 meters took 1.72s, and the total score was: 9.69 seconds.

What information can be learned from this set of data?

1. How does Bolt’s speed change?

2. At which 10 meters did he run the slowest?

Asking a question is more important than solving a problem.

Conduct experiments and collect evidence

(1) First look for other people’s research results on this issue.

(2) Do your own experiments to collect evidence

Explore the movement of the car on the slope

Ask a question:

How does the speed of the car change as it slides down the slope?

【step】

1. Keep the slope at a certain slope, place the car at the top of the slope, place the baffle at the bottom of the slope, and measure the distance s1 that the car will pass.

2. Measure the time t1 from when the car slides down from the top of the slope to hitting the baffle.

3. Calculate the average speed v1 of the car throughout the entire journey through the slope based on the measured S1 and t1.

4. Move the baffle to the midpoint of S1, measure the time t2 it takes for the car to slide from the apex of the slope through the upper half of the slope S2, and calculate the average speed v2 of the car through the upper half of the slope.

5. By calculation

The second half of the journey S3= S1-S2 and

In the second half of the period t3=t1-t2

Calculate the average speed v3 of the car through the second half of the journey.

Possible reasons for the error?

1. The first and second half of the journey are divided equally;

2. timing;

3. Measurement and estimation...

Back to pre-class questions:

How can we prove whether Nan Nan’s running speed is getting smaller or faster?

plan:

Measure a 100-meter distance on the playground track and mark every 20 meters with lime; choose 5 timekeepers to stand at 20 meters, 40 meters, 60 meters, 80 meters, and 100 meters respectively. Then analyze the data to draw conclusions.

Class summary

1. The link of scientific inquiry

2. The average speed of the car moving on the slope (analysis process)

3. Experiment report format

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For more information about the PPT courseware "Changes in the Speed ​​of Scientific Inquiry in a World in Motion", please click the Changes in the Speed ​​of Scientific Inquiry in a World in Motion ppt tag.

"Scientific Inquiry: Changes in Speed" The World of Motion PPT Courseware 3:

"Scientific Inquiry: Changes in Speed" The World of Movement PPT Courseware 3 [Experience] Does the speed of moving objects change? Activity 1: Ride a bicycle freely down the slope and feel the change in speed. Activity 2: Xiao Ming is conducting a 100-meter race test on the playground. (1) Riding...

"Scientific Inquiry: Changes in Speed" The World of Motion PPT Courseware 2:

"Scientific Inquiry: Changes in Speed" The World of Motion PPT Courseware 2 Pre-class game: Who reacts faster? Game rules: Student A holds the top of the ruler with two fingers, and student B is ready to hold the ruler between his fingers. When B sees A letting go of his hand, he immediately clamps the ruler...

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Update Time: 2024-11-15

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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