"Measuring Average Speed" Mechanical Motion PPT Courseware 2

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"Measuring Average Speed" Mechanical Motion PPT Courseware 2

1. What is the experimental principle of "Measuring the average speed of moving objects"?

2. What physical quantities need to be measured to measure average velocity?

3. What instruments are needed to measure distance? What instruments are needed to measure time?

Experimental steps:

Notice:

1. The moving distance of the car is the distance from the front of the car to the front of the car.

2. The trolley must be released from rest from the top of the slope.

3. Do not change the slope of the incline during the measurement process.

1. The slope of the incline should not be too small or too large. Why?

If the slope of the slope is too small, the car's speed-changing movement will not be obvious, and the car may not move; if the slope is too large, the car will move too fast and the time is too short, which will increase the error in time measurement.

2. When Xiaohong measured the distance, he measured from the top of the slope to the end or midpoint of the slope. Is this correct? Why?

wrong. Because the car has a certain length, when measuring the distance, you must measure from the beginning of the car to the end, or from the tail to the end, otherwise the calculation will be wrong.

3. What is the function of the metal piece?

Easy to measure time.

1. Experimental steps for "Measuring the average speed of an object's motion"

①Put the car on _________, put the metal piece on _________, and use _______ to measure the _______ that the car will pass through.

②Use a stop meter to measure the __________ from when the car slides down from ____________ to when it hits ___________.

③Based on the measured _________, use the formula _______ to calculate the ___________ of the entire journey of the car through the inclined plane.

④Move the metal piece to _____________, and measure the _________ from the trolley to the metal piece.

⑤Measure the ________ it takes for the car to slide from _________ to __________, and calculate the ____________ it takes for the car to pass through the first half of the distance.

Understand and consolidate

1. An object moves along a straight road, accelerates from rest to 20m/s in 10s, and moves a total of 80m. The average speed of the object in 10s is [ ]

A. 20m/s b. 10m/s

C. 8m/s D． None of them are right

2. When a car moves in a straight line, it travels at a speed of 20m/s for the first half of the journey and 30m/s for the second half of the journey. During the entire journey, the average speed of the car is _______m/s

summary

1. The link of scientific inquiry

2. A method of measuring the average speed of a car sliding down an incline on different road sections.

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Update Time: 2024-09-30

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

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