People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
Shanghai Science Edition Ninth Grade Physics
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition 8th Grade Physics
Beijing Normal University eighth grade physics volume one
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University Ninth Grade Physics Volume 1
Lu Jiao Edition Ninth Grade Physics Volume 2
Lu Ke Edition High School Physics Compulsory Course One
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
People's Education Press High School Physics Compulsory Course II
Guangdong and Shanghai version of eighth grade physics volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao Edition Eighth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
!["Force" PPT courseware on motion and force](http://daogebangong.oss-cn-beijing.aliyuncs.com/ppt/preview/1/00772712-f34b-43cd-931b-b9683f02e810.webp)
Category | Format | Size |
---|---|---|
Beijing Normal University eighth grade physics volume 2 | pptx | 6 MB |
Description
"Force" PPT courseware on motion and force
three elements of force
When pushing the door, use the same amount of force at point A and point B. Will the effect be the same?
In addition to the size and direction, the point of action of the force will also affect the effect of the force.
Three elements of force: magnitude, direction, and point of action
When playing football:
(1) The harder the force, the farther the ball flies;
(2) If you kick the ball in different directions, the ball will move in different directions.
The magnitude and direction of the force are different, and the effects are different.
Illustration of force
Definition: Use a line segment with an arrow to represent force, in which the length of the line segment represents the magnitude of the force; the direction of the arrow represents the direction of the force; the starting point of the line segment represents the electricity used to perform the force.
force diagram
Definition: A method of representing force by a line segment with an arrow.
The length of the line segment represents the magnitude of the force. The arrow at the end of the line segment indicates the direction of the force. The starting or ending point of a line segment represents the point of application of the force.
How to draw force diagram
1. Determine the force-bearing object and the point of action of the force and the direction of the force.
2. Draw a line segment from the point of action of the force along the direction of the force. The line segment drawn by Li Da is longer.
3. Mark an arrow at the end of the line segment to indicate the direction of the force.
4. Write the symbol and magnitude of common force near the arrow.
Example question analysis
Example: Which of the following statements about force is incorrect: ( )
A: Only objects in contact with each other produce force.
B: When the child pushes the wall hard, he is also pushed by the wall.
C: When people sit on a soft sofa, they can find that the sofa is concave, which shows that the action of force can change the shape of an object.
D: The football player heads the ball, and the direction of the ball changes, indicating that the action of force can change the motion state of the object.
Breakthrough in studying law
There are two types of force effects, which must be distinguished. Objects that are not in contact can also play a role in generating force.
Targeted training
Example: Among the pairs of forces described below, the one that belongs to the interactive force is ()
A: The force of the person pushing against the wall and the resistance of the shoe.
B: The force of the wall on the person and the backward force on the person.
C: The force of the person pushing the wall and the force on the wall.
D: The force of the person pushing against the wall and the force of the wall on the person.
Breakthrough in studying law
Understanding the concept of interaction forces is the key to solving this problem.
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File Info
Update Time: 2024-08-31
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