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"Free Fall Motion" Research PPT on Uniform Speed Linear Motion
Part One: Curriculum Standard Requirements
1. Know what free fall is.
2. Master the conditions and characteristics of free fall motion.
3. Know the magnitude and direction of free fall acceleration.
4. Understand the laws of free fall motion and be able to solve related problems.
Free fall motion PPT, part 2: new self-study textbook
1. Free fall motion
1. Fill it out
(1) Definition: The movement of an object falling from ______ only under the action of ______.
(2) Condition: The initial velocity v0 = 0 is only affected by gravity.
(3) Actual motion: When an object falls due to the effect of ______, the falling of the object is not a free fall motion; only when the air resistance is relatively small and can be ignored, the falling of the object can be approximately regarded as ______.
2. Give a verdict
(1) The vertical falling motion is free fall motion. ( )
(2) The movement of an object only under the action of gravity is free fall. ( )
(3) The motion of falling raindrops from high altitude is free fall motion. ( )
(4) The falling motion of water droplets falling from the eaves can be regarded as free falling motion. ( )
3． Choose one
(1) Regarding free fall motion, which of the following statements is correct ()
A. The motion of an object falling from rest is called free fall
B． If the air resistance is much smaller than gravity, the air resistance can be ignored. At this time, the falling motion from rest is a free fall motion.
C． The movement of a cotton ball starting from rest is free fall.
D． The motion of raindrops passing through the window can be regarded as free fall motion.
(2) Take a glass tube about 1.5 m long, with one end closed and a switch on the other end. Put the metal piece and small feathers into the glass tube. Turn the glass tubes upside down and observe their fall. Then evacuate the air from the glass tube, turn the glass tube upside down, and observe their fall again. Which of the following statements is correct ()
A. When the glass cylinder is filled with air, the metal piece falls as fast as a small feather
B． When the glass tube is filled with air, both the metal piece and the small feathers undergo free fall motion.
C． After the air is extracted from the glass cylinder, the metal piece falls as fast as the small feather
D． After the air is extracted from the glass tube, the metal piece falls faster than the small feather
2. Free fall acceleration
1. Fill it out
(1) Definition: At the same place, the acceleration of all objects falling freely is ____. This acceleration is called ____, also called ____.
(2) Direction: ____downward.
(3) Size: At the same place on the earth, the size of g is certain; at different places on the earth's surface, the size of g is generally ____. In general calculations, g can be ____ m/s2 or ____ m/s2.
2. Give a verdict
(1) The direction of gravity acceleration is always vertical downward. ( )
(2) The magnitude of the acceleration due to gravity is always equal to 9.8 m/s2. ( )
(3) The acceleration of gravity on the moon is also 9.8 m/s2. ( )
(4) In rough calculation, the magnitude of gravity acceleration can be taken as 10 m/s2. ( )
Free Fall Movement PPT, Part 3: Improving New Knowledge
Breakthrough point 1: Understanding of free fall motion and free fall acceleration
1. Understanding free fall motion
(1) Conditions: ①The initial velocity is zero, ②it is only affected by gravity.
(2) Motion properties: It is a uniformly accelerated linear motion with initial velocity v0 = 0 and acceleration a = g.
(3) vt image: It is an inclined straight line passing through the origin (as shown in the figure), with a slope k=g.
2. Understanding free fall acceleration (acceleration due to gravity)
(1) Direction: vertically downward.
(2) Size: ① At the same place, the acceleration due to gravity is the same. It has nothing to do with the quality, size and other factors of the object.
②The size is related to the latitude on the earth and the height from the ground
relationship with latitude
On the surface of the earth, the acceleration of gravity increases with increasing latitude, that is, the acceleration of gravity is minimum at the equator and maximum at the poles, but the difference is not big.
relationship with height
At the same point on the ground, the acceleration due to gravity decreases with height. However, at a not too high altitude, it can be considered that the magnitude of the acceleration due to gravity remains unchanged.
[Special Reminder]
(1) The direction of gravitational acceleration can neither be said to be "vertically downward" nor "pointing toward the center of the earth." Only at the equator or the poles does the direction of gravitational acceleration point to the center of the earth.
(2) Objects can also undergo free fall motion on other planets, but the gravitational acceleration on the surfaces of different celestial bodies is different.
Free fall exercise PPT, part 4: training new literacy
1. STSE questions, reflecting active learning and application
As shown in the picture, the man in the cartoon uses stones to estimate the depth of a well. Do you think it makes sense? Why?
[ Tips Since the propagation speed of sound in the air is relatively large, the time it takes for the sound of a falling stone to reach human ears can be ignored. Therefore, the time from when the stone starts falling to when the sound of the falling stone is heard can be considered equal to the time t of the free falling stone. To sum up, it is reasonable for the man in the comic to use stones to estimate the depth of the well.
2. Simulation timer (scientific inquiry of core competencies)
(1) One student holds a paper tape and moves, and another student holds a paintbrush and clicks on the paper tape at certain intervals (such as once per second or 2 times per second) (as shown in Figure 1). Compare to see who can move the paper tape with the least change in speed.
(2) In order to understand the acceleration process of a classmate's walking, the teacher asked him to walk with a beverage bottle with holes in the bottom and dripping water evenly, and then analyzed his speed changes through the watermarks left on the ground (Figure 2). Please give it a try and explain why.
[ Tips The closer the spacing is to equal, the smaller the change in the speed of the paper tape movement.
(2) The water dripping from the beverage bottle is relatively even, which means that the time interval between the two watermarks on the ground is equal. If the distance between the watermarks gradually increases, it means that the walking students are accelerating; the distance between the watermarks is equal, which means that the walking students are speeding up. Movement at a constant speed; the distance between watermarks gradually decreases, indicating that the walking students are slowing down.
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For more information about the PPT courseware "Research on Uniform Speed Linear Motion and Free Fall Motion", please click on the "Research on Uniform Speed Linear Motion PPT Free Fall Motion" PPT tag.
"Free Fall Motion" Research on Uniform Speed Linear Motion PPT Free Courseware:
"Free Fall Motion" PPT free courseware on the study of uniformly variable linear motion Part 1: "Learning Objectives" 1. Know the conditions for objects to undergo free fall motion. 2. Explore the characteristics of free fall acceleration through experiments and establish the concept of gravity acceleration. Know..
"Free Fall Motion" Research on Uniform Speed Linear Motion PPT courseware download:
"Free Fall Motion" Research on Uniform Speed Linear Motion PPT Courseware Download Part One Content: [Learning Literacy Targets] Physical Concepts: 1. Know the conditions, characteristics, and properties of free fall motion. 2. Know that free fall motion is a uniform speed straight line Exercise and know the weight...
"Free Fall Motion" Research PPT teaching courseware on uniformly variable linear motion:
"Free Fall Motion" Research PPT Teaching Courseware on Uniform Speed Linear Motion Part One Content: Course Standard Requirements 1. Understand what free fall motion is and know that it is a uniformly accelerated linear motion with an initial velocity of zero. 2. Know the conditions and characteristics of free fall motion..