"Description of Motion" Mechanical Motion PPT Courseware 4

Description

"Description of Motion" Mechanical Motion PPT Courseware 4

Mechanical motion and diversity of motion

1. In physics, changes in the position of an object are called mechanical motion. (Such as a speeding meteor, a galloping cheetah, a wriggling snail, etc.)

2. Movement is the most common phenomenon in the universe. In addition to mechanical movement, there are also movements of molecules and atoms, electromagnetic movement, and various life movements.

3. Think about the discussion on page 17 of the textbook and the situation on the next slide. Can you explain the reasoning behind it?

2. The movement and rest of an object are relative

1. Reference object: When studying the motion of an object, another object selected as the standard is called the reference object.

A reference object is an object that is assumed to be immobile.

(The research object cannot be used as a reference object. Both moving and stationary objects can be used as reference objects)

2. The relativity between motion and stillness

Whether the same object is in motion or at rest depends on the chosen reference object.

3. Selection of reference objects: To study the movement of objects on the ground, the ground or objects fixed on the ground are often selected as reference objects.

Can you judge the reference?

1. "The sun rises in the east and sets in the west." The movement of the sun is based on ______

2. "The moon passes through the clouds", the movement of the moon is based on _____

Movement or stillness?

The Yangtze River Adventure Rafting Team rides bamboo rafts down the river. Using the river bank as a reference, the bamboo raft is _____; and using the flowing water as a reference, the bamboo raft is _______.

Breakthrough of Difficulties

1. Given a reference object, how to determine the motion and rest of an object?

2. If the object is known to be moving or stationary, how to determine the reference object?

practise

1. We see white smoke coming out of factory chimneys. The reference is _____. Passenger A sitting in a moving car sees Passenger B stationary. The reference is ____. It is said in daily life that "the sun rises from the east. The reference for "Sunset over the Western Mountains" is ______.

2. The blackboard is moving with ____ as the reference object, and it is stationary with ____ as the reference object.

3. Verse: "My eyes are full of storms and waves, and when I look at the mountains it seems like they are coming to greet me. If I look closely at the mountains, they are motionless, and it's like a boat is moving." Among them, "Looking at the mountain is like walking to greet it" is based on ____; "It's like a boat is sailing" is based on ____.

4. Passengers sitting in car B feel that car A is driving eastward. What conditions might car B be in?

5. Each of the following phenomena has nothing to do with relative stillness ( )

① Refueling the plane in the air; ② Running to deliver drinks to marathon runners; ③ The sun rises in the east;

④Colorful clouds cover the moon; ⑤The mystery of "catching bullets"; ⑥Walking around like a shadow

A, ② ③ ⑥ B, ② ④ ⑤

C, ① ③ ⑤ D, ③ ④

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Update Time: 2024-10-17

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

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