"Motion and Stillness" Simple Movement of Matter PPT Courseware 3

Description

"Motion and Stillness" Simple Movement of Matter PPT Courseware 3

All objects are in motion

Strictly speaking, all objects in nature, from microscopic particles to celestial bodies in the universe, are constantly moving.

The world is in motion

When a person changes position relative to the steps, we say he is moving.

When water changes position relative to mountains, we say it is in motion

When the position of the train changes relative to the building, we say it is moving

The position of the teaching building relative to the lawn does not change, we say it is stationary

To describe whether an object is moving or stationary, you must first select a standard object as a reference. This selected standard object is called a reference object.

If the position of an object changes relative to the reference object, we say it is moving; if the position does not change, we say it is stationary.

How to determine whether an object is stationary or in motion

① Select appropriate reference objects

② Whether the position of the object relative to the reference object changes.

relativity of motion

Due to different selection of reference objects, the same object can be stationary or moving. So, although motion is absolute, the description of motion is relative.

So, how to describe whether an object is moving or stationary?

The key depends on the reference you choose

How to choose a reference object?

The choice of reference object is arbitrary, but it is generally not appropriate to choose the object to be judged itself.

Usually we default to the ground or an object fixed on the ground as the reference object for the relativity between motion and rest.

Now ask students to think about it. Among the sports you have seen, according to the characteristics of the routes they pass, how many categories can they be divided into?

Classification of sports:

According to whether the object's movement route is a straight line or a curve, the movement of the object is divided into linear motion and curved motion.

feedback exercise

1. A car is driving on a horizontal river bank. Using the car as a reference object, its reflection in the river is ________; using the river bank as a reference object, its reflection in the river is ________.

2. There are escalators in the newly built large department stores. When you stand on the moving escalator and go upstairs, it is said that you are moving, using ______ as the reference; saying that you are stationary is Use ______ as a reference.

3. Regarding the same object, A says it moves north and B says it moves south. Please give an example.

4. Xiao Ming was traveling by plane with his father. When the plane was about to land, the stewardess asked all passengers to sit still in their seats and fasten their seat belts. Xiao Ming fastened his seat belts, but he was thinking: I am sitting here. Did he really not move? How could I have landed on the ground if I hadn't moved? Can you help Xiao Ming explain it?

summary

1. Given a reference object, how to determine the motion and rest of an object?

The selected reference object’s positional relationship remains unchanged and is relatively stationary.

(Assumed to be stationary) Positional relationship changes Relative motion

2. If the object is known to be moving or stationary, how to determine the reference object?

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For more information about the PPT courseware "Simple Movement of Matter, Motion and Rest", please click on the "Simple Movement of Matter ppt, Motion and Rest ppt" tab.

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Update Time: 2024-08-30

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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