"Description of Motion" Mechanical Motion PPT Courseware 5

Description

"Description of Motion" Mechanical Motion PPT Courseware 5

Want to discuss:

Think about the motion shown above and similar motions. On what basis do people say that these objects are in motion?

1. Mechanical movement

In physics, a change in the position of an object is called _________.

2. Reference object

1. When studying mechanical motion, we need to choose a ______________ as a standard. This object used as a standard is called a reference object.

2. Stationary: An object does not change its position relative to a reference object.

Movement: The change of position of an object relative to a reference object.

3. The reference object can be chosen arbitrarily. Usually we use __________________ as the reference object.

4. The entire universe is composed of matter that is constantly moving. There is no absolutely motionless object. The commonly heard motion and stillness are relative to different _________.

The relativity of motion and rest

(1) To describe the motion of an object, a reference object must first be selected.

(2) The selection of the reference object can be arbitrary, but the object to be judged cannot be selected as the reference object.

(3) After an object is selected as a reference object, it is assumed that the object is stationary. In fact, the reference object itself may also be moving.

(4) For the same object, the motion state can be different if the reference object is different.

Summary

Mechanical motion: The change in the position of an object is called mechanical motion.

Reference object: When describing the movement of an object, the object that is assumed to be stationary in advance is called the reference object.

Relativity between motion and stillness: To say that an object moves or is still is relative to a certain reference object. Different reference objects are chosen, and the motion state of the object is generally different, so motion and stillness are relative.

Consolidation exercises

1. There are three sightseeing elevators A, B, and C. Passengers in A see a tall building moving downward, passengers in B see A moving downward, and passengers in C see both A and B moving upward. Then these three elevators The motion relative to the ground may be ( )

A. A is upward, B is downward, and C is motionless.

B. A is upward, B is upward, and C is not moving.

C. A is up, B is up, C is down.

D. A, B, and C are all upward, but A and B are slower than C.

2. 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 ______ _; taking athlete B as a reference, athlete A is _______.

3. 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 with boats, people are ________ and trees are ________.

4. Small bamboo rafts line the middle reaches of the river, and walk along both sides of the towering green mountains. The first sentence uses ________ as a reference; the second sentence uses __________ as a reference.

5. Among the following movements, which one is linear movement ( )

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

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Update Time: 2024-11-19

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

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