"Gravity" force PPT download

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"Gravity" force PPT download

Part One: Preview Perception

1. Gravity

1. Concept: The force exerted on an object due to _____________.

2. Force-exerting object: _____.

3. Universality: __________ near the ground is affected by gravity.

2. The size of gravity

1. The amount of gravity an object experiences is proportional to its mass.

2. Formula: __________, where g is a fixed value with size _____.

3. Direction of gravity

1. Direction:__________.

2. Application: Use __________ to determine the vertical direction and check whether the wall is vertical.

4. Center of gravity

1. Concept: __________ of gravity on an object.

2. The center of gravity of an object with uniform texture and regular shape is on its __________.

3. Schematic diagram of gravity: Use a line segment with an arrow to represent the magnitude, __________ and __________ of gravity.

5. The origin of gravity

1. The scientist who discovered: __________.

2. Gravity: Objects in the universe, from large celestial bodies to small dust, all have the force of __________.

Gravity PPT, Part 2: Interactive Classroom Understanding

Understanding the direction of gravity

The direction of gravity is always vertically downward, that is, always perpendicular to the local horizontal plane.

(1) "Vertically downward" and "vertically downward" are different. "Vertical downward" has nothing to do with the contact surface (or terrain) of the object, such as direction 1 in the figure; while "vertical downward" is related to the contact surface (or terrain) of the object, which means downward perpendicular to the contact plane. As shown in direction 2 in the figure.

(2) The direction of gravity on an object has nothing to do with whether the object is moving, how fast it is moving, or the direction (path) of the movement. It is always vertical downward.

[Example] In a physical education class, a pushed shot put rolls forward along the horizontal ground after landing (as shown in the picture). The following figure can correctly represent the direction of the gravity of the shot put ()

Analyze this question to examine the direction of gravity. All objects on the surface of the earth are affected by gravity regardless of their motion state, and the direction of gravity is vertically downward, so choose C.

AnswerC

Gravity PPT, Part 3: Try the application

1. The concept of gravity

1. Regarding the statement about gravity, the correct statement is ()

A. Only objects in contact with the ground are affected by gravity

B. Only stationary objects are affected by gravity

C. Rockets flying at high speed in the air are no longer affected by gravity

D. Gravity is the force generated by an object being attracted to the earth

Analysis: Gravity is caused by the attraction of the earth. All objects on the earth are affected by gravity, whether they are moving or stationary, or whether they are on the ground or in the air, so A, B, and C are wrong.

2. As shown in Figure A, the apples on the tree will fall to the ground because of __________; as shown in Figure B, the crashed plane will fall faster and faster, and eventually cause disaster, because of __________.

Analysis This question examines phenomena related to gravity in life. Apples will fall to the ground, and crashed planes will fall faster and faster because of the influence of gravity.

Answer: The apple is affected by gravity. The airplane is affected by gravity.

2. The size of gravity

3.9.8 The physical meaning expressed by N/kg is ()

A.9.8 N equals 1 kg

B.9.8 kg is equal to 1 N

C. The gravitational force on an object with mass 9.8 kg is 1 N

D. The gravitational force on an object with a mass of 1 kg is 9.8 N

Analysis Units of different physical quantities cannot be converted. A and B are wrong; the physical meaning of 9.8 N/kg is that the gravity exerted by an object with a mass of 1 kg near the ground is 9.8 N. C is wrong and D is right.

4. During ramming, the rammer is thrown high and then falls, hitting the working surface... If the gravity of the rammer when it falls to the ground is 300 N, then its mass is __________kg, regardless of the effect of height on g. The impact is __________ (optional "change" or "unchanged") compared to the gravity when it is lifted and dropped. (g is taken as 10 N/kg)

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.

"Gravity" force PPT teaching courseware:

"Gravity" force PPT teaching courseware Part 1: Classification practice 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 not..

"Gravity" force PPT (the direction and center of gravity v in Lesson 2):

"Gravity" Force PPT (Lesson 2: Direction of Gravity and Center of Gravity v) Part One: Knowledge Points Basic Knowledge Point 1 Direction of Gravity 1. When building a house, the heavy vertical line that can be used to check whether the walls are vertical is based on gravity. It is made of the nature that the direction is vertically downward. ..

"Gravity" force PPT (calculation of gravity and magnitude of gravity in Lesson 1):

"Gravity" Force PPT (Calculation of Gravity and Gravity in Lesson 1) Part One: Knowledge Points Basic Knowledge Point 1 Gravity 1. Gravity is the force on an object due to the attraction of the earth; cars have (optional yes or no) ) is affected by gravity. 2. small..

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Update Time: 2024-09-06

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

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