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Authoritative PPT Summary
"Power" Power PPT teaching courseware
The first part of the content: Practice on classification of knowledge points
Knowledge point 1 Power
1. Force is the effect of _______ on _______, its unit is _______, abbreviated as _____, and its symbol is ____.
2. When you press the spring with your hand, the spring is bent. The object exerting the force is _____, and the object receiving the force is _____.
3． Which of the following statements about force is correct ()
A. Forces only occur between objects that are in contact with each other
B． As long as there is an object, there will be a force
C. Force cannot exist independently of an object
D． An isolated object can also produce force
4. Which of the following objects is lifted with a force closest to 1 N()
A. two eggs
B． A desk for students
C. a pin
D． a brick
Knowledge point 2: The effect of force
5. The scene in Figure 7-1-1 shows the effect of force. Figure ________ shows that force can change the motion state of an object, and Figure ________ shows that force can deform an object. (Choose "A", "B" or "C" for each)
6． In the following process, there is a force whose effect is different from the other three. It is ()
7. Among the phenomena given below, the motion state of the object has not changed ()
A. A car that continues to move forward after turning off its engine
B． The car turns at a constant speed
C. A paratrooper descending in a straight line at a constant speed in the air
D． The pendulum swings back and forth
Li PPT, the second part of the content: Comprehensive training with regular methods
8. As shown in Figure 7-1-3, the incorrect statement about "the effect of force" is ()
A. Picture A: The pulling force of the fishing line on the fishing rod causes the fishing rod to deform.
B． Picture B: The pressure of the bottle on the sponge causes the sponge to deform.
C. Picture C: The force exerted by the racket on the table tennis ball changes the direction of movement of the table tennis ball.
D． Tuding: If you kick a football hard with your feet, it can fly out, which shows that an object can also produce force.
9. Television stations often report on car accidents. Most car accidents are caused by drunk driving. Traffic police often use alcohol testers to measure the alcohol concentration of drivers’ breath. Which of the following statements is correct ()
A. The deformation of a car after being hit shows that force can change the motion state of an object
B． The deformation of the car after being hit shows that force can deform objects
C. Force can only deform an object
D． Force can only change the state of motion of an object
10. Tie a bucket with a rope, and lift the water upward from the well with the rope. At this time, the bucket receives an upward force. The object exerting the force is ________, and the object receiving the force is ______.
Power PPT, the third part: practical practice of high-frequency test questions
11．2018·Zhangjiajie On the football field, the goalkeeper saves the ball out of the penalty area, which shows that force can ____________________; Xiaoli printed beautiful fingerprints on the plasticine, which shows that force can ____________________.
Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, PPT download, .PPT format;
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"Power" Power PPT courseware download:
"Force" Force PPT courseware download Part 1: Classification practice of knowledge points Knowledge point 1 The three elements of force and the schematic diagram of force 1. The ______, ______, and _______ of force are called the three elements of force, and they affect the ________ of force. 2. As shown in Figure 7-1-4,...
"Power" Power PPT download:
"Force" Force PPT download Part 1: Complete explanation of textbook knowledge Knowledge point 1 Force 1. Concept: Force is the effect of an object on an object. There are two objects that act, one is the force-exerting object, and the other is the force-receiving object. In physics, force is represented by the letter F. 2.Unit:..
"Power" Power PPT:
"Force" Force PPT Part One Content: Preview Perception 1. Force 1. Concept: Force is the _______ of an object on an object. 2. The two objects that act are one is the _______ object and the other is the _______ object. 3. Unit of force: _______abbreviation_______symbol_____..