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Authoritative PPT Summary
"Force" Familiar and unfamiliar force PPT courseware 3
teaching objectives
1. Understand the three elements of power.
2. Understand the units of force and have specific feelings about 1N, 10N, etc.
3. Ability to express force using schematic diagrams.
Review question: What are the effects of force?
(1) Force can deform objects
(2) Force can change the motion state of an object
1. Three elements of force
Experiments show that forces of different sizes, forces in different directions, and forces at different points of action have different effects on objects.
Conclusion: In physics, the magnitude, direction and point of action of a force are called the three elements of force.
2. Unit of force
1. The unit of force----Newton, referred to as Newton, the symbol is (N)
For example, the force required to lift two eggs by hand is about 1N
Physics textbook is about 3N
The 600ml bottled mineral water we usually drink is about 12N
A 50kg classmate weighs 500N
3. Schematic diagram of force
People often draw a line segment with an arrow on the object receiving force along the direction of the force to represent the force the object receives in this direction. This method of expressing force is called a force diagram.
Note: The length of the line segment roughly represents the magnitude of the force; the arrow represents the direction of the force; the starting point or end point of the line segment can represent the point of action of the force.
Consolidate and practice
1. Draw a schematic diagram showing the support force of the wooden block on the table and the pulling force of the electric wire on the lamp.
2. Draw a schematic diagram of the pressure of the wooden block on the tabletop
3. Draw a schematic diagram showing the pulling force F1=9N (at an angle of 300 degrees to the horizontal direction) and the pushing force F2=6N on the car.
4. Draw a schematic diagram of the attraction between magnetic poles with the same name.
In conclusion:
1. In physics, the magnitude, direction and point of action of a force are called the three elements of force.
2. The unit of force - Newton, referred to as Newton, the symbol is (N)
3. In the schematic diagram of force, the length of the line segment roughly represents the magnitude of the force; the arrow represents the direction of the force; the starting point or end point of the line segment can represent the point of action of the force.
1. As shown in the picture, an electric lamp on the ceiling is pulled to one side by a string. Draw a schematic diagram of the pulling force of the wire and the pulling force of the string on the electric lamp.
2. As shown in the figure, there is a small car on the slope, and the upward traction force F is 40N. Draw a schematic diagram of this force in the figure.
3. A pulls the car with a force at an angle of 30º to the horizontal direction, and B pushes the car horizontally with a force of 40N. Draw a schematic diagram of the pulling and pushing forces on the car.
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