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"Force" Force PPT (Lesson 1: Force and the effects of force)
Part One Content: Basic Knowledge Key Points
Knowledge point 1 Power
1. When a ship moves forward, it encounters resistance from water. The object exerting this force is the "water" and the object receiving the force is the "ship".
2. When a person kicks a ball, there is a force between the foot and the ball. If the ball is used as the research object, the force-exerting object is the foot and the force-receiving object is the ball.
3. Among the following statements about force, which one is correct (A)
A. The two objects that generate the force must be acting on each other
B. Only one object is needed to generate force
C. Force is a characteristic of the object itself
D. Two objects in contact with each other must produce a force.
Knowledge point 2: The effect of force
4. The word "moving" in the idiom "the wind blows and the grass moves" shows that the effect of the force of the wind and grass is to change the motion state of the object.
5. As shown in the figure, Figure ①②③ shows that force can change the shape of an object; Figure ④ shows that force can change the motion state of an object.
Power PPT, part 2: improvement of comprehensive capabilities
7. As shown in the picture, if you press the tip of the pencil with your finger, the muscles of the finger will be tense and painful, indicating that the tip of the pencil exerts a force on the finger (select "yes" or "no").
8. In early July 2018, a large area of violent storms occurred in northern Anhui, causing many trees to be bent or even broken by the strong wind. As shown in the picture is the scene when the strong wind passed by, which shows that force can change the shape of objects.
9. The ancient myth of "Chang'e flying to the moon" has become the reality of China's aerospace industry. The "Chang'e-1" satellite launched by my country has achieved orbit changes (changing its altitude and direction) by injecting gas multiple times in space. This actually uses the principle in physics that "force can change the motion state of an object."
10. The force used when the following objects are lifted is closest to 10 N (A)
11. Which of the following phenomena can illustrate that force can change the motion state of an object (A)
A. The trajectory of the medicine ball thrown by the students is an arc.
B. Lobster becomes more curved after being cooked
C. Geckos can lie on the ceiling steadily without falling down
D. The athlete bends the pole during pole vaulting
Power PPT, the third part: Expand, explore and break through
16. In the debate with the theme of "power", the pros and cons put forward many opinions. Xiao Ming summarized their opinions into the following table. The views you think are correct include ②④⑥⑦ (fill in the serial number).
View
Pros and Cons
① When two objects come into contact with each other, there must be a strong effect. ② When two objects come into contact with each other, there may not necessarily be a strong effect.
③If two objects are not in contact with each other, there must be no force. ④If two objects are not in contact with each other, there may be a force.
⑤ Force can exist alone without an object. ⑥ Force cannot exist alone without an object.
⑦The generation of force always involves two objects ⑧One object can also produce the effect of force
17. As shown in the figure, two plane mirrors M and N are placed on a table, and a beam of light is reflected by the two plane mirrors in turn, and finally hits point P on the scale to form a light spot. If you press down on the desktop with force F where the arrow points, the light spot on the scale will move downward (optional "up" or "down"). Using such a device, one of the effects of force that is not easy to detect - deformation can be "amplified" to the point where it can be directly seen.
Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, download of force PPT, download of force and the effect of force PPT, .PPT format;
For more information about the PPT courseware "Force and the Effect of Force", please click on the Force ppt Force and the Effect of Force ppt tag.
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