"Mechanical Movement" PPT

"Mechanical Movement" PPT

Part One: 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:

In order to judge whether an object is moving or stationary, an object is often selected in advance as the standard.

We call the object selected as the standard reference object.

Mechanical motion PPT, part 2: selection of reference objects:

The selection of reference objects can be arbitrary, but it should be based on needs and convenience, and should be conducive to problem research.

Therefore, the object of study should be clearly defined, and the object itself cannot be used as a reference.

Generally speaking, when studying the movement of objects on the ground, the ground or objects fixed on the ground are often chosen as the reference object; when studying objects (such as spaceships) leaving the ground, the earth should be chosen as the reference object. If it enters orbit and moves around the sun, the sun should be chosen as the reference object.

Give it a try:

Among the following motions, which one is linear motion ( )

①When using the abacus, the movement of the abacus beads on the rod

②When pushing the shot put, the movement of the shot put after leaving the hand

③The falling movement of raindrops when there is no wind

④The movement of light in the same homogeneous substance

⑤The movement of an airplane taxiing on the runway before takeoff

⑥The movement of the sun relative to the earth

⑦High jump

Mechanical motion PPT, part 3: Let me give it a try:

1. During a skydiving performance, two skydivers A and B jumped from the plane hand in hand. When descending, if the plane is used as the reference object, they are ( ); using the ground as the reference object, athlete A is ( ) ; Taking athlete B as a reference, athlete A is ( ) .

2. The boat is going down the river. There is a person sitting in the boat. There are trees on the river bank. Compared with trees, people are ( ) and boats are ( ). Compared to boats, people are ( ) and trees are ( ).

3. The passengers sitting in the car, the driver and the students on the roadside had a conversation as shown in the picture. The following analysis is correct ( )

A. Students think that the car is moving fast because they use the car as a reference

B. No matter what is chosen as the reference object, the passengers will not move.

C. The driver said that the passenger did not move because he was using the car as a reference.

D. The characters in the picture all use the ground as a reference to judge whether the object is moving.

Mechanical motion PPT, part 4 content: Discussion:

1. What would happen if we use a camera to record the electric fan in the classroom?

2. If the camera is mounted on the blade of an electric fan and shoots downwards, what will be the difference in the results? Why?

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"Mechanical Movement" PPT courseware:

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