"Motion and Stillness" Mechanical Movement PPT Courseware

Description

"Motion and Stillness" Mechanical Movement PPT Courseware

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

Classification of mechanical motion:

For mechanically moving objects, some of their movement trajectories are straight lines and some are curves.

The motion trajectory is a linear motion, which we call linear motion.

The motion trajectory is a curved motion, which we call curved motion.

Taking the pen cap on the desktop as a standard, the position of the pen relative to the pen cap has changed, and the pen is moving;

Taking the textbook as the standard, the position of the pen relative to the textbook does not change, and the pen is stationary.

2. Reference object

⑴Concept: When studying whether an object is moving or stationary, the object selected as the standard is called the reference object.

⑵Selection of reference objects:

①The reference object can be selected arbitrarily, and both moving and stationary objects relative to the ground can be used as reference objects. (Research subjects cannot be used as reference objects)

②Once the reference object is selected, it is assumed that the reference object is stationary. If the position of the object under study changes relative to the reference object, the object is in motion. On the contrary, the object is stationary.

3. The movement and rest of an object are relative.

If the reference objects selected are different, the conclusions will generally be different when describing the motion of the same object.

practise:

1. Two people A and B walk forward side by side. If B is used as a reference, A is ______, and the trees on the roadside are ______; if the ground is used as a reference, A is ______.

2. Sit in a moving car and watch the trees and houses move backwards. The reference object is ______. The seats in the car don't move. The reference object is ______.

3. A passenger sitting in a boat traveling against the current is said to be stationary. The selected reference object is ( )

A. Trees on the river bank B. Boat cabin C. Oncoming boat D. River water

4. As shown in the figure, the oil receiving aircraft and the large tanker fly in the air at the same speed and in the same direction. Among the following statements, the correct one is ( )

A. Select the ground reference object, the oil receiver is stationary

B. Select the oil receiver as the reference object. The oil tanker is stationary.

C. Select the oil dispenser as a reference object. The oil receiver is moving.

D. Select the ground as the reference object, and the tanker will be stationary when refueling.

Operation

1. Questions 1, 2, 3, and 4 on textbook P25 (3 and 4 are formal assignments).

2. "Learning with You".

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

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Update Time: 2024-10-02

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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