"Motion and Stillness" Simple Movement of Matter PPT Courseware 2

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"Motion and Stillness" Simple Movement of Matter PPT Courseware 2

(1) Reference object

1. Mechanical motion: The change of the position of one object relative to another object is called mechanical motion, or simply called motion.

2. Stillness:

An object is said to be at rest if its position relative to another object does not change.

3. Reference object: The selected standard object when describing the movement and rest of the object.

Reference object: When studying the motion of an object, another object selected as the standard is called the reference object.

A reference object is an object that is assumed to be immobile.

(The research object cannot be used as a reference object. Both moving and stationary objects can be used as reference objects)

Ways to describe an object at rest or in motion:

(1) Select a reference object;

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

Student Activities:

Work in pairs, put the textbook on the table, put an eraser (or ruler) on the textbook and push the textbook to move slowly along the table. The two discussed and answered each other:

Select the desk as a reference object. Are the eraser and textbook moving or stationary?

Choose the textbook as a reference object. Are the eraser and desk moving or stationary?

Choose the eraser as a reference object. Are the desks and textbooks moving or stationary?

4 Relativity of motion

Due to different selections of reference objects, the motion and rest conditions of the same object may be different. This is the relativity of motion.

The relativity of motion and rest:

Whether the same object is in motion or at rest depends on the chosen reference object.

Reference object selection:

To study the motion of objects on the ground, the ground or objects fixed on the ground are often chosen as reference objects.

Applications of Relative Motion: Aircraft Wind Tunnel Testing

Using the wind tunnel as a reference, the airplane is ____;

If the wind is used as a reference, the airplane is ____.

Relatively stationary application: aerial refueling

Relatively stationary conditions:

(1), the speed of movement is the same

(2), the direction of movement is the same

(4) What are the applications of the relativity between motion and rest?

1. Examples from sports competitions

Taking over the baton in a relay

During a marathon race, you have to hand out drinks to the athletes while running.

2. Examples from science and technology

geostationary satellite

Aircraft refueling

Two spacecraft docking in the sky

Class exercises:

1. A poet took a boat and looked into the distance, and wrote a famous poem: "The scenery is full of twinkling lights. Looking at the mountains seems to be coming to greet you. If you look closely, the mountains are motionless, it is the boat moving." The poet describes the mountain twice in the poem, and the reference objects he chooses are ( )

A. Wind and water B. Ship and ground

C. Mountains and boats D. Wind and ground

2. There is a sentence in the Chinese classic novel "Flowers in the Mirror": "Last year, a strong wind suddenly blew a well in my courtyard outside the fence." This is based on _____.

3. A car is driving fast eastward on a straight road, and a person is walking eastward on the sidewalk of the road. If the car is used as a reference, the person is ( )

A moves eastward B is stationary

C moves westward D cannot be determined

After the skydiver leaves the plane, he seems to be stationary in the air. Where should the camera shoot at this time? Why does it have this effect? Does this effect occur when shooting on the ground?

Which object do we see moving? Which object is it used as a reference?

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Update Time: 2024-11-15

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

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