"Motion and Stillness" Simple Movement of Matter PPT Courseware 5

"Motion and Stillness" Simple Movement of Matter PPT Courseware 5

1. Mechanical movement

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

The key to judging whether it is mechanical movement is whether the position of the object changes relative to other objects. If the position changes, the object is said to be in motion; if the position does not change, the object is said to be stationary.

think about it

The following phenomena belong to mechanical motion ()

A. The May 4th Movement B. The sun rises in the sky

C. Feeling excited D. The iron is rusty

2. Reference objects

Reference object: The selected standard object is called the reference object.

1. The selection of reference objects is arbitrary, whether they are stationary or moving objects, they can be selected as reference objects.

2. Once the reference object is selected, it is assumed that the object is stationary.

3. The object being studied cannot be used as a reference. Any object using itself as a reference is always static.

3. The relativity between motion and stillness

Movement and rest are relative. To describe the movement of an object, you must first select a reference object, otherwise it will be impossible to judge.

How many categories can the motion of objects be divided into according to their paths?

4. Classification of sports

1. According to routes

linear motion

curved motion

2. According to speed

uniform motion

variable speed movement

practice

1. When a train passenger was about to arrive at Jinzhou Station, he said excitedly: "Jinzhou is coming to me." The reference of his sentence is ( ) or ( ).

2. "Small bamboo rafts are in the middle reaches of the river, and towering green mountains are walking on both sides." What are the bamboo rafts and the green mountains used as references?

3. During World War I, a French pilot discovered what seemed to be a "little bug" next to him while flying at an altitude of 200 meters. He reached out to grab it and was surprised to find that it was a bullet made in Germany. Ask the students to think and discuss based on the relativity of motion, why can he catch the bullet with his hand?

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