"Speed ​​of Movement" Mechanical Movement PPT Teaching Courseware

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"Speed ​​of Movement" Mechanical Movement PPT Teaching Courseware

Part One Content: Basic Knowledge Key Points

Knowledge point 1: How to compare the speed of exercise

1. To describe the movement speed of an object, we can either compare the length of the distance when the time is the same; we can also compare the length of the time when the distance is the same. In track and field games, the spectators in the stands use the first method to judge the speed of athletes, while the finish line referees use the second method to judge the speed of athletes.

Knowledge point 2 Speed

2. The speed of the moving train is 50 m/s. The physical meaning of this sentence is (C)

A. The train moves at a speed of 50 m per second

B. The distance traveled by the train per second is 50 m/s

C. The distance traveled by the train per second is 50 m

D.The distance traveled by the train is 50 m

3. The normal speed of an object moving is about 5 m/s. The object may be (D)

A.Train B.Car

C. People walking D. Bicycles

Knowledge point 3: Uniform linear motion and variable speed linear motion

4. A classmate starts running and runs 2 m in the first s, 3 m in the 2 s, and 4 m in the 3 s. Then his average speed in the first 3 s is 3 m/s.

5. "Stroboscope photography" is a commonly used experimental method when studying the movement of objects. As shown in the figure, in the two stroboscopic photos, the person moving in a straight line at a constant speed is A (optional "A" or "B"). Because A travels the same distance in equal time.

6. Which of the following objects may move in a straight line with uniform speed (A)

A. A train traveling on a straight track

B. Train entering the station

C. Objects falling from upstairs

D.The bus leaving the platform

PPT on the speed of exercise, part 2: improvement of comprehensive ability

8. We often use "stroboscopic photos" to study the movement of objects. Figure 1 records the different positions of two moving balls A and B every 0.01 s. During the time recorded on the film, the average speed of ball B is larger. The image in Figure 2 describes the movement of ball A.

9. As shown in the figure, two objects A and B start from the same place at the same time and travel along the same straight line and in the same direction. The image changes with time (s-t image). Analyzing the image, it can be concluded that: ① During this process, the ratio of the speeds of the two objects A and B is 2:1; ② If the two objects A and B continue to move in a straight line at a uniform speed and the speed remains unchanged, when t=120 At s, the two objects are 600 m apart.

10. The motion of the following objects can be approximately regarded as uniform linear motion (D)

A.Raindrops falling from the sky

B. A football rolling on the grass after leaving your feet

C. The "Beidou" satellite that rotates around the earth at a constant speed

D. Goods transported on the conveyor belt in the workshop

11. We usually say "Liu Xiang runs faster than you", the physical meaning of this sentence is (B)

A. It took Liu Xiang longer than you to travel the same distance.

B. Through the same distance, Liu Xiang takes less time than you

C. In the same time, Liu Xiang’s distance is shorter than yours

D. Liu Xiang’s movement speed is slower than your movement speed

The speed of exercise PPT, the third part: Expansion, exploration and breakthrough

18. Two cars A and B move at a constant speed along the same straight line in the same place at the same time. The s-t image of car A is as shown in the figure. If the distance between the two cars is 0.6 m when they move for 3 s, then the distance between car B and the starting point when they move for 6 s is (D)

A. It must be 3.6 m B. It may be 3.0 m

C. It must be 1.8 m D. It may be 1.2 m

19. There is an escalator in a shopping mall. When a customer goes upstairs along the moving (upward) escalator, he can count 16 steps. When he walks down the moving (upward) escalator at the same speed (relative to the elevator) When walking upstairs, we can count 48 steps, then the number of steps of the escalator is (C)

A.Level 22 B.Level 32

C. Level 24 D. Insufficient conditions and cannot be determined

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For more information about the "Speed ​​and Slow of Mechanical Movement" PPT courseware, please click on the "Speed ​​and Slow of Mechanical Movement ppt" ppt tag.

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Update Time: 2024-09-02

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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