"Measuring Average Speed" Mechanical Movement PPT Teaching Courseware

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"Measuring Average Speed" Mechanical Movement PPT Teaching Courseware

Part One Content: Basic Knowledge Key Points

Knowledge point: Measuring the average speed of an object’s movement

1. Use an inclined plane and a slider to do the "Measuring the Average Speed ​​of an Object" experiment. As shown in the figure, the timing starts when the slider starts from the top and stops when it slides to the bottom of the inclined plane. During this process, the average speed of the slider is (B)

A.10 cm/s B.9 cm/s

C.8 cm/s D.7 cm/s

2. In the experiment of measuring the average speed of an object, if the measured movement time of the object is larger than the actual value, then the measured average speed of the object (C)

A. Same as the actual value B. Larger than the actual value

C. Smaller than the actual value D. Uncertain

3. In the experiment of "measuring average speed" using the method shown in the figure, please answer the questions according to the figure:

(1) The experimental principle is v=?/?;

(2)The measured distance is 0.910m;

(3) Assuming that the time taken is 7 s, then the average speed of the car is 0.13 m/s;

(4) During the experiment, the slope of the inclined plane should be very small. The reason is that

Make the car move on the slope for a longer time, which facilitates measurement time and improves the accuracy of measurement.

Measuring average speed PPT, part 2: improvement of comprehensive capabilities

4. Xiaohua walks to school every day. He wanted to know the distance from his home to school, so he conducted the following inquiry. First, Xiaohua walked 100 m on the school track at a walking speed of 80 s, so his walking speed was 1.25 m/s. In order to ensure that the measurement results are relatively accurate, in addition to accurate timing, the walking speed must also be controlled unchanged. Finally, Xiaohua measured that it takes him 20 minutes to walk to school, so the distance from his home to school is 1500 m.

5. As shown in the figure, the situation of a car traveling on a straight road and covering the distance in the same time is recorded. It can be seen from the figure that the average speed of the car from 20 s to 40 s is 37.5 m/s.

6. Xiao Ming uses a scale and a digital clock (hour: minute: second) to measure the speed of the wooden block sliding on the horizontal surface. The position and time of the wooden block sliding are as shown in the figure. The sliding distance of the wooden block is 5.00 cm. The average speed is 0.025 m/s, which is 0.09 km/h.

7. Xiaojun uses the following four methods to measure the average speed of a ball rolling along the table. What do you think is the most reasonable one (A)

A. First select a longer distance and measure the time it takes for the ball to pass through this distance.

B. First select a shorter distance and measure the time it takes for the ball to pass through this distance.

C. First select a longer period of time and measure the distance traveled by the ball during this period.

D. First select a short period of time and measure the distance traveled by the ball during this period.

8. As shown in the figure, Xiao Ming measured the average speed of a ball on an incline in the laboratory. The ball rolled down the incline and was photographed every 0.1 s with a camera. The following statement is correct (D)

A. The ball is stationary relative to the table

B. It takes 0.3 s for the ball to move from point A to point C.

C. The distance traveled by the ball from point A to point C is 15 cm

D. The average speed of the ball moving from point A to point D is 1 m/s

9. A football moves in a straight line on the grass, and the speed becomes slower and slower. As shown in the figure, the measured length of segment AB is equal to the length of segment BC. The time it takes for the football to pass through segment AB is 0.5 s, and the length of segment AB is 3 m. Then the average speed of the football from A to C may be (A)

A.4 m/s B.6 m/s

C.7 m/s D. All of the above are possible

Measuring average speed PPT, part 3: Expansion, exploration and breakthrough

13. In physics, the distance traveled by an object in unit time is called speed. The calculation formula of speed is speed = "distance" / "time", that is, v = s/t, and the unit is m/s. This way of defining physical quantities The method is called the ratio definition method. There are also many physical quantities defined in this way in high school physics. For example, the change in the speed of an object within unit time is called acceleration (Note: The change in speed is represented by Δv, which is equal to the difference between the front and rear speeds; acceleration is represented by the letter a, the international unit. is m/s2). From the definition of acceleration we know:

(1) The definition of acceleration is a= Δv/t;

(2) If an object starts moving at a speed of 2 m/s and changes to 8 m/s after 5 s, then the speed change of the object within 5 s is Δv = 6 m/s;

(3) If the object in question (2) moves in a straight line at a uniform speed (the changes in speed per unit time are the same), then the acceleration of the object is a = 1.2 m/s2.

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Update Time: 2024-11-17

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