"Motion and Stillness" Mechanical Movement PPT Courseware 2

Description

"Motion and Stillness" Mechanical Movement PPT Courseware 2

learning target

★ Master the concept of mechanical motion.

★ Know the reference objects and their characteristics.

★ Understand the relativity between motion and stillness.

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

Feedback exercise 1:

1. In physics, the change in the position of one object relative to another object is called mechanical motion.

2. Which of the following phenomena does not belong to mechanical motion ( )

A. Earth moves around the sun

B． Athletes running

C. spring breeze blowing

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

Why do children say that passengers are moving, but drivers say that passengers are stationary?

To say whether an object is moving or stationary depends on which object is used as the standard. The object chosen as the standard is called the reference object.

Example 1: In the development of emerging aircraft, the flight of the aircraft in the air can be simulated by placing the aircraft stationary in the mouth of the wind tunnel and letting the simulated air flow blow towards it. At this time, the pilot in the cabin feels that the plane is flying, then the reference object he chooses is ( )

A. Aircraft B. Simulated airflow C. Ground D. Himself

Analysis: Using the ground as a reference, the aircraft and the pilot are stationary in the wind tunnel, and the simulated airflow is moving. If the aircraft is used as a reference object, the pilot is stationary, the ground is stationary, and the simulated airflow is moving. If the simulated airflow is used as a reference object, both the aircraft and the pilot are moving, and so is the ground. According to the meaning of the question, if the pilot in the cabin feels that the aircraft is flying, then the reference object he chooses should be simulated airflow. Answer: B

How to determine whether an object is stationary or moving:

1. Select a reference object;

2. Whether the position of the object changes relative to the reference object.

Student Activities:

Work in pairs and place the pen on the textbook with the pen cap and pen aligned on the table. Drag the textbook and carefully observe the movement of the pen and pen cap. The two discussed and answered each other:

Choose a textbook as a reference. Are the pen cap and pen moving or stationary?

Choose the pen cap as a reference. Is the pen moving or stationary?

Choose a pen as a reference object. Is the pen cap moving or stationary?

Feedback exercise 2:

1. Among the following types of movements, the ones that use the ground as a reference are ( )

A. People on Earth believe that geostationary communications satellites are stationary

B． Xiao Ming and Xiao Yun walked side by side on the playground. Xiao Ming thought Xiao Yun was still.

C. Xiao Ming, a classmate, was sitting on a moving train and saw the trees on the roadside receding.

D． The moon climbs the treetops

2. Which of the following statements is correct ( )

A. We can only choose stationary objects as reference objects

B． The reference object can be chosen arbitrarily, but after we select the reference object, we must regard it as moving

C. When studying whether an object is moving, sometimes it is not necessary to select a reference object

D． Movement is absolute, but description of movement is relative

3. Passengers sitting on a moving bus, relative to the trees on the roadside, the passengers are _____, the bus is _____; relative to this bus, the passengers are _____, the roadside The tree is _____.

4. When a fighter is refueling in the air, if the tanker is used as a reference, the fighter is _____; if the ground is used as a reference, the fighter is _____.

"Motion and stillness" among celestial bodies

1. Who is the reference for when we usually say "the sun rises in the east and sets in the west"?

2. Who is the reference for the saying "the earth revolves around the sun" in geography?

3. Geosynchronous satellites are moving synchronously with the earth. If the earth is used as a reference, are the geosynchronous satellites moving or stationary?

"Motion and stillness" in anecdotes

During World War I, a French pilot found a small thing next to his face while flying at an altitude of 2,000 meters. The pilot thought it was an insect and quickly grabbed it. To his surprise, what he caught was actually an insect. A German bullet. How could this French pilot have such great abilities?

Feedback exercise 3:

1. There are two trains A and B waiting for departure side by side at a certain station. People in train A see the trees outside the window moving eastward, while people in train B see train A not moving. If the ground is used as a reference, explain ( )

A. Car A moves westward, car B does not move

B． Car B moves westward, Car A does not move

C. Car A moves west, car B moves east

D． Cars A and B move westward at the same time at the same speed.

2. The boat is going down the river. There is a person sitting in the boat and there are trees on the bank. Compared to trees, people are _____ and boats are _____; compared to boats, people are _____ and trees are _____.

3. A small passenger car was driving east on a straight road. The passengers in the car saw a large bus retreating from their car, but it retreated slower than the trees on the roadside. Then, using the passenger car as the reference object, the bus will drive toward _____; using the ground as the reference object, the bus will drive toward _____.

Class summary

1. Mechanical motion: In physics, we call the change in the position of one object relative to another object called mechanical motion.

2. Reference object: Whether an object is moving or stationary depends on which object is used as the standard. The object chosen as the standard is called the reference object

Determine whether an object is moving or stationary

Take a look at which object to choose as a reference.

Second, check whether there is a change in position between the object being judged and the reference object.

3. Movement is a common phenomenon in the universe. The motion and rest of an object are relative.

Target Detection:

1. Usually we often say "dark clouds cover the moon", using _____ as a reference; saying "the moon hides in the clouds", use _____ as a reference.

2. A geosynchronous satellite is always stationary somewhere above the earth, which is used as a reference; if the moon is used as a reference, this geosynchronous satellite is _____.

3. Living on the earth, when you see the sun rising in the east and setting in the west, the reference object you choose is ( )

A.Sun B.Earth C.Moon D.Distant stars

4. Regarding the reference object, which of the following statements is correct ( )

A. The reference object can only be a stationary object

B． The reference object can only be an object that moves in a straight line at a uniform speed.

C. The reference object can be a stationary object or a moving object.

D． For the same object, if you choose different reference objects, the mechanical motion will be different.

5. A skydiver saw the helicopter next to him moving upward while he was falling. The movement of the helicopter relative to the ground ( )

A. Must rise B. Must fall C. Must be still D. Unable to judge

6. Observe the smoke and small flags in the picture. Regarding the movement of cars A and B relative to the house, which of the following statements is correct ( )

A. Cars A and B must move to the left

B． Cars A and B must want to move

C. Car A may be stationary and car B may move to the left.

D． Car A may move, car B may move to the right

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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: 2024-11-24

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

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