"Description of Motion" Mechanical Motion PPT Download

Description

"Description of Motion" Mechanical Motion PPT Download

The first part: sorting out new knowledge

1. Mechanical movement

In physics, we call the change of an object ________ over time as mechanical motion.

2. Reference object

When studying the motion and rest of objects, the object chosen as the standard is called __________.

[Pointing]The universe is composed of moving objects, and there are no absolutely stationary objects. Therefore, when describing the movement of an object, it is necessary to select an object as a reference in advance. Usually when we describe the movement of objects, we usually default to the ground or objects fixed on the ground as the reference object.

3. The Relativity between Movement and Rest

Different reference objects are chosen, and the conclusions are generally different when describing the movement of the same object. It can be seen that the motion and rest of an object are ________.

[Pointing]The relativity between motion and rest has three meanings: ①Motion is absolute, and there is no absolutely motionless object; ②Station is relative; ③The motion state of an object depends on the selected Reference object, the selected reference object is different, and the motion state of the research object is generally different.

Description of motion PPT, part 2: application examples

Type 1 The concept of mechanical motion

Example 1 Which of the following phenomena is not mechanical motion ()

A． Meteors streak through the night sky

B. Mercedes Benz

C. Plants bloom and bear fruit

D. Earth revolves around the sun

[ Analysis Movement; the earth revolves around the sun, and the position of the earth relative to the sun changes, which is mechanical movement.

[Method Guidance]Methods for judging mechanical motion:

When judging whether the phenomenon described belongs to mechanical motion, it is necessary to clarify the concept of mechanical motion, that is, to see whether the position of the object changes with time.

Type 2: Selection and judgment of reference objects

Example 2 2018·Chenzhou A passenger sitting in a boat traveling against the current is said to be stationary, and the selected reference object is ()

A． Trees on the river bank B. cabin

C. Oncoming ship D. river water

[ Analysis , so B conforms to the meaning of the question; using the oncoming boat as the reference object, the passenger's position has changed, so the passenger is moving, so C does not conform to the meaning of the question; using the river as the reference object, the passenger's position has changed, so the passenger is moving , so D does not meet the meaning of the question.

Type 3: Relativity between motion and rest

Example 3 2017·Yiyang Two graduate students from a certain university got inspiration from ants and designed the "Urban Ant" concept car as shown in Figure 1-2-2. This concept car is small and practical, and will help alleviate urban traffic congestion. Regarding the car driving on the road in the center of the city, which of the following statements is correct ()

A． Using the road as a reference, the car is stationary

B. Using the trees on the roadside as a reference, the car is stationary

C. Using the houses on the roadside as a reference, the car is moving

D. Using the driver in the car as a reference, the car is moving

[ Analysis , the houses on the roadside are used as reference objects, the "Urban Ant" concept car is moving; relative to the driver in the car, the position of the car has not changed, so using the driver in the car as the reference object, the car is stationary, Therefore C is correct.

Description of sports PPT, part 3 content: classroom feedback

1. Among the following situations, which one does not belong to mechanical motion is ()

A． falling objects

B. ice melts into water

C. Movement of artificial earth satellites

D. moving car

2. As shown in Figure 2-1, a customer standing on a moving escalator often feels that he is stationary. The reference object he chooses is ()

A． Ground b. Escalator C. wall d. ceiling

3． On the day of the Dragon Boat Festival, Xiao Ming went to Nan Lake with his father and mother. They sat in a moving boat and watched the scenery of Nan Lake. Xiao Ming thought that his father was athletic, and the reference he chose was ()

A． boat b. Xiao Ming C. Trees on the shore D. Mother

4. We carry schoolbags to school every day. If the schoolbag is said to be stationary, the chosen reference may be ________. When you walk out of school after school, if you use the classroom as a reference, your schoolbag is ________ (optional "movement" or "stationary").

5. Shown in Figure 2-2 is a set of shapes formed by stunt skydivers when performing in the air at a height of 3000 m above the ground. Taking athlete A as the reference object, athlete B is ________ (optional "stationary" or "movement").

6. During the May Day holiday, Xiaoli and her mother took a sightseeing bus to play in Juzizhoutou, Changsha. If the sightseeing bus is used as a reference, Xiaoli is ________. If the trees on the roadside are used as a reference, Xiaoli is ________of. (Please fill in "Movement" or "Station")

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For more information about the "Description of Mechanical Motion" PPT courseware, please click on the "Description of Mechanical Motion ppt Motion" ppt tag.

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Update Time: 2024-07-02

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

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