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Authoritative PPT Summary
"Gravity" PPT courseware
Part 1: Why do objects fall?
Whereabouts will occur if the plane crashes
The diver will fall
Ripe fruits will fall
Water flows from high places to low places, etc.
The earth attracts everything around it downwards
Gravity PPT, Part 2: Learning Gravity
The force exerted on an object due to the attraction of the Earth
Unit of gravity: Newton (N)
Everything near the ground is affected by gravity
think
Which object exerts the gravity on an object?
(1) Direction of gravity
1. Hang the ball on the crossbar of the iron stand. When the ball is stationary, observe the direction of the thin line and draw the position of the thin line in Figure 3-48A of textbook P103.
2. Tilt the iron stand at an angle, observe the direction of the thin line, and draw the position of the thin line in Figure 3-48 B of textbook P103.
3. Confirm the direction of gravity based on experimental phenomena
Conclusion: The direction of gravity is always vertically downward (perpendicular to the horizontal plane).
The direction of gravity - always vertically downward
The pressure of the wood block on the incline
The weight of the block
(2) The point of action of gravity
The point where gravity acts on an object is called the center of gravity
The mass is evenly distributed. The center of gravity of a regular-shaped object is its geometric center.
(3) The size of gravity
The gravity exerted on an object is the weight of the object!
Factors related to gravity
As a force, the magnitude of gravity can be directly measured using a spring dynamometer, but what factors are related to the magnitude of gravity?
Combined with life experience: What assumptions would you make?
①The size of gravity may be related to the mass of the object. The greater the mass, the greater the gravity.
②The size of gravity may be related to the volume of the object. The larger the volume, the greater the gravity.
Gravity PPT, Part 3: Consolidation Practice
1. Which of the following objects experiences a gravity close to 10N ( )
A.A pencil B.A liter of water
C. A desk D. A TV
2. The ball accelerates down the slope. The correct diagram about the gravity on the ball is ( )
3. Regarding the meaning of g=9.8N/kg, which of the following statements is correct ( )
A.1kg is equal to 9.8N
B. The gravity on an object with a mass of 9.8kg is 1N
C. The gravity experienced by an object with a mass of 1kg is 9.8N.
D. An object with a mass of 9.8kg experiences a gravity of 9.8N.
4. A car sliding down from a bridge, the gravity it experiences during the sliding process ()
A. The size changes but the direction remains unchanged.
B. The size remains unchanged and the direction remains unchanged.
C. The size increases but the direction remains unchanged.
D. Size decreases and direction changes
Gravity PPT, Part 4: Summary:
Concept: The force exerted on an object due to the attraction of the earth
Direction: vertically downward
Size: G=mg g=9.8N/kg
Point of action: the center of the regular object
Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, gravity PPT download, .PPT format;
For more information about the "Gravity" PPT courseware, please click the Gravity ppt tab.
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"Gravity and Center of Gravity" interaction PPT courseware:
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