| Category | Format | Size |
|---|---|---|
| Shanghai Science Edition 8th Grade Physics | pptx | 6 MB |
"The Force from the Earth" Familiar and Unfamiliar Forces PPT Courseware 3
Description
"The Force from the Earth" Familiar and Unfamiliar Forces PPT Courseware 3
1. Gravity
The force on an object due to the attraction of the earth
The object exerting force by gravity is: Earth
Water always flows from high to low
Apples always fall to the ground
2. Description of gravity
1. In daily life, the amount of gravity exerted by an object is often referred to as its weight.
2. Gravity is represented by G.
3. The unit of gravity is: Newton (N).
4. The gravity of an object is measured with a spring dynamometer.
3.Quality
1. The amount of matter an object contains is called mass.
2. Mass is represented by m (or M).
3.Unit of mass
SI unit of mass: kilogram (kg)
There are also grams (g) and tons (t)
1t=1000kg; 1kg=1000g.
4. The size of gravity
1. Size: G = mg
G — Gravity (N); g = 9.8 N/kg
2. The physical meaning of g:
It means that the gravity exerted by an object with a mass of 1 kilogram is 9.8 N. The unit of g: N/kg
3. Take 10 N/kg for rough calculation.
Example: The mass of a small ball is 100g, what is the gravity N it experiences?
It is known that: m=100g=0.1kg, g=9.8N/kg.
Asking for: G＝?
Solution: According to G=mg, we get
G＝mg＝0.1kg×9.8N/kg＝0.98N
Answer: The gravity it experiences is 0.98N.
5. Direction of gravity
What is the direction of gravity on an object?
Use a thread to hang an object. When the object is stationary, the direction of the thread is called the vertical direction. The vertical direction is always perpendicular to the horizontal direction and points toward the center of the earth.
The direction of gravity is vertically downward.
6. The point of action of gravity
1. The point where gravity acts on an object is called the center of gravity
2. The center of gravity of an object with uniform mass distribution and regular shape
on its geometric center. For example: the center of gravity of a spherical object is at the center of the sphere.
7. Information window
1. Stability: The degree of stability of an object
2. Methods to improve stability:
a. Increase the support area
b. Lower the center of gravity
summary:
1. Gravity size: G = mg
2. The physical meaning of g
3. The direction of gravity is vertically downward.
4. The center of gravity of an object with uniform mass distribution and regular shape is at its geometric center.
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For more information about the PPT courseware "Familiar and Unfamiliar Forces Come from the Earth", please click on the "Familiar and Unfamiliar Forces PPT Forces from the Earth" PPT tag.
"Force from the Earth" Familiar and Unfamiliar Forces PPT Courseware 5:
"Force from the Earth" Familiar and unfamiliar forces PPT courseware 5 1. What is gravity? The force exerted on an object due to the attraction of the earth. 2. The calculation formula for the magnitude of gravity G=mg (g=9.8N/kg) 3. The direction of gravity The direction of the four gravity forces is always vertical downward..
"Force from the Earth" Familiar and Unfamiliar Forces PPT Courseware 4:
"Force from the Earth" Familiar and Unfamiliar Forces PPT Courseware 4 Observation and thinking: 1: Release a heavy object freely 2: Throw an object horizontally 3: Observe a picture of water flowing downwards Phenomenon Why does the following phenomenon occur? 1: The heavy object falls vertically, 2: Thrown..
"Force from the Earth" Familiar and Unfamiliar Forces PPT Courseware 2:
"Force from the Earth" Familiar and Unfamiliar Forces PPT Courseware 2 [Experience] Gravity Activity 1: Hold the rubber with your hand, let go and then fall, and observe the movement of the rubber. Activity 2: Throw the rubber upward and observe the movement of the rubber. The rubber eventually falls to _________..
File Info
Update Time: 2024-07-04
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