"Gravity" force PPT teaching courseware

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"Gravity" force PPT teaching courseware

The first part of the content: Practice on classification of knowledge points

Knowledge point 1 The origin of gravity

1. The force exerted on an object due to __________ is called gravity, usually represented by the letters ____. The object exerting the force of gravity is ______.

2. If there is no gravity, which of the following statements is incorrect ( )

A. The river no longer flows and the waterfall is no longer visible

B. As soon as a person jumps up, he leaves the earth and can never come back.

C. Objects will still fall to the ground after being thrown

D． The water in the cup cannot be poured into my mouth

3． A football flying towards the goal, if the force of the air on it is not taken into account, then the ball ( )

A. Only the kick from the foot

B. No force

C. Only affected by gravity and kicking force

D． only affected by gravity

Knowledge point 2 The magnitude of gravity

4. Xiao Rong explored the "relationship between gravity and mass". As shown in Figure 7-3-1A, he hung the hook codes on the spring dynamometer one by one, measured the gravity they received respectively, and recorded it in the table below middle.

(1) Fill in the blanks in the form completely.

(2) According to the experimental data in the table, in the figure

Draw the relationship between gravity and mass in B.

(3) The conclusion can be drawn from the image: _______________________________________________.

5. The gravity exerted by an object is proportional to its mass, which is expressed as _______; the ratio g=________, and its physical meaning is ____________________________.

6． The correct calculation process for the following calculation of the gravity on a 10 kg object is _____. (optional serial number)

①G＝mg＝10×9.8 N/kg＝98 N

②G＝mg＝10 kg×9.8 N/kg＝98 N

③G＝mg＝10 kg×9.8 N＝98 N

④G＝mg＝10 kg×9.8＝98 N

7. As shown in Figure 7-3-2 is a compressed biscuit specially designed for astronauts. Its mass is 100 g, so the gravity it experiences is ____N. If astronauts take it to the moon, the gravity it experiences will be _____ (select Fill in "increase", "decrease" or "unchange"). (g is taken as 10 N/kg)

Knowledge point 3 Direction of gravity

8. The direction of gravity is "vertically downward". Among the following four options for understanding "vertically downward", the correct one is ( )

A. Vertical down

B. Perpendicular to the ground downward

C. Perpendicular to the desktop downwards

D． vertically downward

9. Regarding the direction of gravity, which of the following expressions is correct ( )

10. Tie a heavy hammer under the thin line to make a plumb line. You can use it to check whether the wall of the building is ______. It takes advantage of the property of _______________.

Gravity PPT, part 2: Comprehensive training with regular methods

13. Figure 7-3-5 shows four schematic diagrams depicting people at different locations on the earth releasing stones from their hands. The dotted lines in the diagram represent the falling path of the stone. The description of the falling path of the stone is the closest to the actual schematic diagram. yes( )

14. Xiao Ming saw in the textbook that construction workers used plumb lines to check whether the walls were vertical and was inspired. When he made his own "plumb lines" and hung them on the pillars in front of the door, the situation as shown in Figure 7-3-6 A and B appeared. Relative to the bottom of the column, the top of the column ( )

A. Slightly tilted to the southeast

B. Slightly tilted to the southwest

C. Slightly tilted to the northwest

D． Slightly tilted to the northeast

15． The space shuttle flies in space if scientists want to conduct experiments in it. So under the condition of "complete weightlessness", which of the following operations cannot be performed correctly ( )

A. Measure the temperature with a thermometer

B. Measuring grip strength with a grip dynamometer

C. Measuring mass with a scale

D． Measuring time with a watch

16． A hook code is hung under the spring dynamometer. The hook code is acted upon by ____ force and ____ force. The objects exerting these two forces are _____ and __________ respectively.

17． The mass ratio of objects A and B is 6:5. It is known that the gravity of object A is 1200 N, then the gravity of object B is ______N.

Gravity PPT, the third part: practical practice of high-frequency examination questions

21．2018·Zhuzhou A jar containing a small amount of beverage can be placed diagonally on a horizontal table to maintain balance. Among the following four figures, the schematic diagram that can correctly represent the gravity on the beverage can (including beverage) is ( )

22．2018·Neijiang As shown in Figure 7-3-10, a soccer ball is pushed out by a football player, and a schematic diagram of the forces on the soccer ball when it is flying in the air is drawn (excluding air resistance).

Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by the People's Education Press, gravity PPT download, force PPT download, .PPT format;

For more information about the "Force and Gravity" PPT courseware, please click on the "Force ppt and Gravity ppt" tab.

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Update Time: 2024-09-11

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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