"Description of Motion" Mechanical Motion PPT Courseware 2

Description

"Description of Motion" Mechanical Motion PPT Courseware 2

(1) Mechanical movement

In physics, a change in the position of an object is called _________.

Explanation: Mechanical motion is the most common phenomenon in the universe, which refers to changes in the relative positions of macroscopic objects.

1. Select the table as the standard. Are the pencil case and textbook moving or stationary?

2. Select the textbook as the standard. Are the pencil case and table moving or stationary?

3. Select the pencil box as the standard. Are the textbooks and table moving or stationary?

According to different standards, the movement and rest of objects are different.

(2) Reference objects

1. When studying mechanical motion, we need to choose a ______________ as a standard. This object used as a standard is called a reference object.

2. Stationary: An object does not change its position relative to a reference object.

Movement: The change of position of an object relative to a reference object.

3. The reference object can be chosen arbitrarily. Usually we use __________________ as the reference object.

4. The entire universe is composed of matter that is constantly moving. There is no absolutely motionless object. The commonly heard motion and stillness are relative to different _________.

(3) The relativity between motion and stillness

(1) To describe the motion of an object, a reference object must first be selected.

(2) The selection of the reference object can be arbitrary, but the object to be judged cannot be selected as the reference object.

(3) After an object is selected as a reference object, it is assumed that the object is stationary. In fact, the reference object itself may also be moving.

(4) For the same object, the motion state can be different if the reference object is different.

Summary

Mechanical motion: The change in the position of an object is called mechanical motion.

Reference object: When describing the movement of an object, the object that is assumed to be stationary in advance is called the reference object.

The relativity of motion and rest:

To say that an object is moving or stationary is relative to a certain reference object. Different reference objects are chosen, and the motion state of the object is generally different, so motion and rest are relative.

Consolidation exercises

1. Which of the following objects’ motions belongs to mechanical motion ( )

A. The temperature of the iron rod in the furnace increases

B. Rise in prices in the market

C. Xiao Li is sitting on the train bound for Shanghai

D. The molecules that make up matter are in constant motion.

2. During a skydiving performance, two skydivers A and B jumped from the plane hand in hand. When descending, if the plane is used as the reference object, they are _______; using the ground as the reference object, Athlete A ______ _; taking athlete B as a reference, athlete A is _______.

3. The boat is going down the river. There is a person sitting in the boat. There are trees on the river bank. Compared with trees, people are ________ and boats are ________. Compared with boats, people are ________ and trees are ________.

Keywords: mechanical motion teaching courseware, description of motion teaching courseware, People's Education Edition eighth grade physics PPT courseware download, eighth grade physics slide courseware download, mechanical motion PPT courseware download, description of motion PPT courseware download, .PPT format;

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

"Optimization Summary of this Chapter" Movement Description PPT:

"Optimization Summary of this Chapter" Description of Motion PPT Integration and Improvement Analysis of Several Groups of Physical Concepts 1. Time and Moment It is necessary to have a correct understanding of the expressions of time and moment. For example, the end of the 1st s, the 5th s (the end of the 5th s), the beginning of the 3rd s (the end of the 2nd s), etc. are all moments; the first 2 s ..

"Acceleration" description of motion PPT download:

"Acceleration" Description of Motion PPT Download Part One Content: Foundation for Necessary Knowledge Literacy 1. Acceleration 1. Textual expression: The ratio of the object ____________________ to the _________ used to produce this change is represented by the letter ______. 2. Targeting: (1..

"Acceleration" motion description PPT courseware:

"Acceleration" Description of Motion PPT Courseware Part One Content: Course Standard Requirements 1. Understand the concept of acceleration and know the meaning of its directionality. 2. Can tell the difference between v, v and vt. 3. Able to judge the movement of objects based on the directional relationship between speed and acceleration. ..

File Info

Update Time: 2024-11-22

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

Preview