"Mechanical Movement" PPT courseware

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"Mechanical Movement" PPT courseware

Part One: Reference Objects

Reference object: An object chosen as a standard.

1. When people judge whether an object is moving or stationary, they always choose a certain object as the standard first.

2. Relative to this standard, if the position of an object changes, it is considered to be in motion;

3. Relative to this standard, if the position of an object does not change, it is considered stationary.

When we select the boy reference object, the girl's position relative to the boy does not change, so the boy feels that the girl has not moved.

When the spectators standing nearby chose the ground as a reference object, the girl's position relative to the ground changed, so they felt that the girl was moving.

Mechanical motion PPT, part 2 content: thinking and discussion:

1. Imagine that you are taking a sightseeing elevator upstairs. People on the ground think that you are moving upward with the elevator, but other people in the elevator think that you are standing still in the elevator. Why is this?

Movement and rest are relative to reference objects.

1. Using the ground as a reference object, when your position relative to the ground changes, people on the ground think you are moving.

2. Using the elevator as a reference object, your position relative to the elevator remains unchanged, so other people in the elevator think that you are standing still.

When vaulting, are the athletes moving or stationary relative to the ground?

When vaulting, the athlete's position relative to the ground changes, so the athlete is in motion.

2. The car you are sitting in happens to be parked side by side with another car. When you see the car next to you driving slowly, you suddenly feel that the car you are sitting in is moving slowly. But when you look out the window on the other side, you feel that the car you are sitting in is moving slowly. I found that the car I was sitting in was not moving at all. Using the chair in the car as a reference, you feel like you haven't moved. Can you explain this phenomenon?

1. Movement and stillness are relative to reference objects.

2. Using the slowly moving car next to you as a reference, the position of the car you are sitting in changes, so you feel that the car you are sitting in is moving.

3. Using the ground outside the window as a reference, your position in the car remains unchanged. The car you are sitting in is stationary, so you feel that it is not moving.

4. Your position relative to the car chair you are sitting in has not changed, so you feel that you have not moved.

Mechanical motion PPT, part three: mechanical motion and its classification

1. Linear motion and curved motion

2. Classification of linear motion

Mechanical motion classification

Mechanical motion can be divided into linear motion and curved motion according to the motion route.

Linear motion classification

1. Uniform linear motion: linear motion that covers the same distance in the same time and the speed of the motion remains unchanged.

2. Variable speed linear motion: The distance traveled in equal time is not equal, and the speed of motion changes.

Mechanical motion PPT, part 4: practice

1. Our country has successfully achieved manned space flight. During the launch stage of the spacecraft, the astronaut is fixed in the cockpit. When selecting which of the following objects as a reference object, the astronaut is stationary? ( )

A． The cockpit of the spaceship B. clouds in sky

C. Launcher on the ground D. Survey ship monitoring in the Pacific Ocean

To judge whether an object is moving or stationary, the key is to look at the selected reference object. If the position changes between the two, the object is moving; if the position does not change, the object is stationary. There is no position change between the astronaut and the cockpit, so they are stationary; there are position changes between the astronaut and the clouds in the sky, the launch pad on the ground, and the tracking and monitoring measurement ship in the Pacific Ocean, and the relationship between them is Sporty.

2. As shown in Figure 3.1-1 A, the car moves in a _____ straight line; as shown in Figure B, there are stroboscopic photos of the falling apple (stroboscopic photos are a set of photos taken by the camera at equal intervals to Reflecting the change in the position of the object over time), the apple makes _______ linear motion

As can be seen from Figure A, the distance traveled by the car in 1 second is 20 meters; as can be seen from Figure B,

The apple is falling. The distances covered in the same time are not equal, and the falling speed is getting faster and faster.

3. The Beijing Olympics will be broadcast live using geosynchronous satellites, although geostationary satellites rotate around the earth. But people on Earth feel that it is motionless above the Earth. This is because the selected reference object is ( )

A． Sun B. Moon C. Earth D. three

4. If an object moves in a straight line, the distance it passes in the first minute, the second minute, and the third minute is all 300 meters. During these 3 minutes, the object does ( )

A． Uniform linear motion B. variable speed movement

C. Variable speed linear motion D. Can not be sure

Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, mechanical motion PPT download, .PPT format;

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"Mechanical Movement" PPT:

"Mechanical Movement" PPT Part One Content: Activities: 1. Are people, cars, and trees on the roadside moving or stationary? 2. Why are there different opinions on whether the trees on the roadside are moving or stationary? Have a group discussion and see which group makes the most sense? Reference: ..

"Measuring Average Speed" Mechanical Motion PPT Courseware:

"Measuring Average Speed" Mechanical Movement PPT Courseware Review 1. What is speed and the formula for speed? 2. How to use the scale correctly? The steps of scientific inquiry: 1. Asking questions 2. Conjectures and hypotheses 3. Making plans and designing experiments 4. Conducting experiments and collecting evidence...

"Speed ​​of Movement" Mechanical Movement PPT Courseware 6:

"Speed ​​and Slow of Movement" Mechanical Movement PPT Courseware 6 Learning Objectives: Be able to use speed to describe the movement of objects. Be able to use speed formulas to perform simple calculations. Know the concept of uniform linear motion. Understand the concept of average speed. Compare the speed of object movement. Understand the concept of speed. .

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Update Time: 2024-10-03

This template belongs to science courseware Zhejiang Education Edition Seventh Grade Science Volume 2 industry PPT template

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