"Making a Timer" PPT

Qingdao version of third grade first volume science, making timer PPT

Part One: Understanding Time

Please observe the changes in the rising and setting of the sun below, and think about it, how do you know that "a day" has passed when there is no timing tool?

The sun rises and sets over and over again. It rises from the east today and rises from the east again the next day. This is how a day passes.

Please observe the change chart of the moon phase profit and loss below, and think about it, how do you know that "one month" has passed when there is no timing tool?

One month passes from this full moon to the next full moon.

Please observe the changes in the scenery of the four seasons below, and think about it, how do you know that "one year" has passed when there is no timekeeping tool?

Spring, summer, autumn, and four seasons cycle once, and a year has passed.

Making a timer PPT, part 2: experiment

Let's do the following experiment and actually measure it.

1. Use a pen and ruler to mark the starting and ending points of a 1 cm length on the incense stick, and measure the length of the incense stick.

2. Light the incense. When the incense burns to the starting point, start timing.

3. When the incense stick burns to the end point of 1 cm, stop the timer

4. Record the time it takes to burn.

Measure the time it takes for the incense stick to burn 1 centimeter, and then multiply it by the total length of the incense stick to calculate the time it takes for one stick of incense to burn.

Making a timer PPT, the third part: experimental design

Try it based on your experimental design, or refer to the following operations.

Measure how long it will take for the hourglass to leak all the sand?

Turn the hourglass upside down and measure how long it takes for the sand to leak out?

Take several more measurements and compare the length of each recording.

How to use hourglass to tell time?

You can use the characteristic that the sand leaks out almost every time to time it.

What are the advantages and disadvantages of using an hourglass to measure time?

Advantages: Simple to use and easy to operate;

Disadvantages: cannot accumulate time, not accurate enough for modern people.

Making a timer PPT, Part 4: Make good use of timing tools

Make good use of timing tools

From ancient times to modern times, timing technology has developed with the progress of life. Many convenient and accurate timing tools have been continuously innovated and used for various purposes.

Tell me, when do you use an alarm clock? When would you use a stopwatch?

Various timing tools in life can give us a lot of help, so we should make good use of them!

Expansion exercises

How would you use the following timing tools in your life? Please briefly describe using a timing tool in one paragraph.

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"Making a Timer" PPT courseware:

Qingdao version of the first volume of third-grade science, making a timer PPT courseware, the first part of the content: Pre-check Pre-check: What tools can help you know the time? Cooperation and communication: Please observe the changes in the rising and setting of the sun below, and think about how to...