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"Elasticity" force PPT teaching courseware
The first part of the content: Practice on classification of knowledge points
Knowledge point 1 Elasticity
1. Objects such as rubber bands and springs will _______________ when they are stressed, and _______________ when they are not stressed. This property of objects is called elasticity; objects such as plasticine cannot automatically _______________ after deformation. This property of objects The property is called plasticity. The force generated by an object due to ________ is called elastic force. The pressure and supporting force commonly referred to are _____.
2. Xiao Ming presses his hand hard on the desktop, and the desktop _____ (optional "yes" or "no") deforms, and at the same time _____ (optional "yes" or "no") elasticity is generated.
3． Which of the following deformations are not elastic deformations ( )
4. In Figure 7-2-2, there must be elastic force between the two balls A and B ( )
5. Which of the following forces is not elastic ( )
A. Pressure on the Coke bottle when holding it
B． Pull force of spring on opponent
C. Magnet's attraction to pins
D． The support of the ground facing the podium
Knowledge point 2 Spring dynamometer and its use
6． As shown in Figure 7-2-3, the measuring range of the spring dynamometer is ______N, and the indication at this time is ____N. Within a certain range, the greater the tension on the spring, the greater the elongation of the spring. The spring dynamometer is made based on this principle.
7. When using a spring dynamometer, which of the following points that must be paid attention to is incorrect ( )
A. The spring dynamometer must be placed vertically and cannot be tilted
B． You must check whether the pointer points to zero before use
C. When using, the spring and pointer should not rub against the shell.
D． The force applied to the spring dynamometer must not exceed its maximum measured value
8. Figure 7-2-4 shows several students using a spring dynamometer. The wrong measurement method is ( )
9. In order to more accurately measure a force of about 6 N, which of the following spring dynamometers should be used ( )
A. The measuring range is 0~10 N, and the graduation value is 0.2 N
B． The measuring range is 0~5 N, and the graduation value is 0.1 N
C. The measuring range is 0~15 N, and the graduation value is 0.5 N
D． The measuring range is 0~20 N, and the graduation value is 0.5 N
10. A classmate explored the relationship between the length of a spring and the change of tension outside class. He used the device shown in Figure 7-2-5. The corresponding experimental data recorded is as follows:
(1) The length of the spring when there is no tension is ____cm. When the spring is under tension of 10 N, its length is ____cm, and the spring stretches ____cm.
(2) Analyze the experimental data and write the relationship between the elongation of the spring and the tension on the spring: ____________________________________________.
(3) Give an example of the practical application of this research: ___________.
Elasticity PPT, part 2: Comprehensive training with regular methods
11． The following is a summary of Xiaoming’s knowledge of elasticity. The correct one is ()
①The basketball can bounce up from the ground because the basketball is affected by the elastic force
②Elastic force can also be generated between objects that are not in contact with each other
③Tensile force is not elastic force
④ Under the condition that the balloon is not crushed, the flatter the balloon is crushed by the hand, the greater the elastic force on the hand.
A. ①③ B. ①④C. ②③ D. ②④
12. Regarding the principle of spring dynamometer, which of the following statements is correct ( )
A. The tension on the spring is proportional to the length of the spring
B． The length of the spring extension is proportional to the tension on the spring
C. The longer the spring, the greater the tension
D． The tension on the spring can be increased indefinitely, and the length of the spring can also be increased indefinitely.
13. There is a spring dynamometer. When there is no force on the hook, the pointer does not point at the zero scale line, but at the position of 0.2 N. At this time, pull the hook of the spring dynamometer by hand to make the spring measure the force. The indication of the meter is 4 N, then the pulling force exerted by the hand is ( )
A. 4.2 N B. 4N
C. 3.8 N D. Unable to judge
14. As shown in Figure 7-2-6, a pulling force F of 3 N is applied to both ends of the spring dynamometer in the horizontal direction and the spring dynamometer remains stationary. At this time, the indication of the spring dynamometer is ( )
A. 0 b. 3N C. 6N D. 1.5 N
15． Within the elastic limit, the elongation amount Δl of the spring is proportional to the tensile force F. In the image shown in Figure 7-2-7, the one that can correctly represent this relationship is ( )
16． A spring with a length of 10 cm is suspended vertically. After the lower end is subjected to a vertical downward pulling force of 4 N, the length of the spring is 12 cm. Within the elastic limit, when the length of the spring is 15 cm, the tensile force on the lower end of the spring is _____N; when the tensile force on the lower end of the spring is 8 N, the length of the spring is _____cm.
Elasticity PPT, the third part: practical practice of high-frequency examination questions
19．2018·Xuzhou Use rubber bands, paper clips, cotton thread, small bottle caps, toothpaste boxes, iron wires, hook codes and scales to make a rubber band dynamometer as shown in Figure 7-2-10. Which of the following statements is wrong ( )
A. The scale can be marked on the toothpaste box
B． You can use the top of a paper clip as a pointer
C. You can use the hook code to stretch the rubber band to mark the scale
D． Different rubber bands have the same force measuring range.
20.2018·Zhuzhou No. 1 spring dynamometer is shown in Figure 7-2-11. Its scale ____ (optional "yes" or "no") is even, the measuring range is _____N, and the graduation value is ____N. The reading is ____N.
Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, download of elasticity PPT, download of force PPT, .PPT format;
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"Elasticity" Force PPT Download Part One Content: Preview Perception 1. Elasticity 1. Elasticity: The property that an object will ______________ when it is stressed and ______________ when it is not stressed. 2. Plasticity: An object will deform when it is subjected to force, and ________ will automatically recover after deformation.
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