"Description of Motion" Mechanical Motion PPT Courseware 6

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"Description of Motion" Mechanical Motion PPT Courseware 6

An advertisement in a Paris newspaper:

"You only need to send us 2.5 cents to get an economical way to travel without any danger or fatigue. Try it!"

Someone sent 2.5 cents to the address. Each of these people got a letter back. What is the content?

"Sir, please lie quietly on your bed, and please remember: Our earth is rotating. At the latitude of -49 degrees in Paris, you have to run more than 2,500 kilometers every day and night. If you like to watch Looking at the beautiful scenery along the road, please open the curtains and enjoy the beautiful scenery of the starry sky!"

The advertiser was brought to court for fraud. During the sentencing, he solemnly repeated Galileo's words: "However, the earth is indeed rotating anyway!"

Movement is absolute and eternal, while stillness is only relative and temporary.

1. The meaning of movement: Movement is change.

2. Forms of movement: social changes; life changes; chemical changes; changes in atomic nuclei; changes in thinking; changes in position...

3. The simplest form of movement: change in the position of an object - mechanical movement.

1. Definition of mechanical motion: The relative change in the position of an object is mechanical motion.

2. Reference object: When judging whether an object is moving, the object selected as a standard in advance and assumed to be stationary is the reference object.

3. Use reference objects to judge the movement of objects. The specific methods are as follows:

① Determine the research object, that is, clearly determine whether the object is moving;

② Select the reference object, that is, assume that an object is not moving;

③See whether the position of the object under study changes relative to the reference object. If the position changes, the object under study is moving. If the position does not change, the object under study is stationary.

4. The relativity between motion and stillness

The motion and rest of an object are relative. Determining whether an object is moving or stationary depends on the reference object selected.

Thinking: In the air battle of World War I, a pilot noticed a "bug" flying towards his cabin, so he grabbed it and discovered that it was a flying bullet! , we know that it is generally impossible to catch a flying bullet with bare hands, so why can this pilot catch it?

Because the bullet's flight speed is very small relative to the aircraft.

Practice in class

1. In physics, changes in __________ are called mechanical motion. Whether the same object is in motion or at rest depends on the __________ chosen, which is the __________ in motion and at rest.

2. Which of the following statements about exercise is incorrect: ( )

A. The movement of all matter in the universe is absolute and eternal;

B. There are no absolutely motionless objects in the universe;

C. The movement and stillness we talk about daily are relative and relative to a reference object;

D. We collectively refer to all mechanical movements as mechanical movements.

3. Which of the following statements is correct: ( )

A. A car passes through a bridge. The car is moving but the bridge is absolutely stationary;

B. The universe is composed of moving objects, and absolutely motionless objects do not exist;

C. The earth and planets all move around the sun, and the sun is absolutely motionless in the universe;

D. After a house is built, it will be fixed in its original position and will not move, so objects fixed on the earth are absolutely immobile.

4. Using the ground as a reference object, a person moves from west to east, and a car catches up from behind. If this car is used as a reference object, the person moves ____________.

5. Two cars are traveling in the same direction. The movement of the cars is described using ________ as a reference. A passenger sitting in car A sees car B moving backwards. The passenger uses ________ as a reference. Comparing the two cars, the ________ car drives faster.

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Update Time: 2024-09-16

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

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