People's Education Press High School Physics Compulsory Course 1

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"Inference of Uniformly Variable Speed ​​Linear Motion (1)" Research on Uniformly Variable Speed ​​Linear Motion PPT

Part One: Basic Review

Two basic formulas for uniform linear motion

Speed ​​formula v=v0+at, when v0=0, v=at

Displacement formula x=v0t+12at2, when v0=0, x=12at2

Since there are many formulas in the kinematics part, and the formulas are related to each other, some of the questions in this chapter can often be solved multiple times.

When solving problems, you should broaden your mind, associate and compare, and select the most convenient solution to simplify the problem-solving process.

PPT on the inference of linear motion with uniform speed, part 2: combination of lecture and practice

Selection of basic formulas for uniform speed linear motion

1. Comparison of four formulas

2. Application steps of the formula

(1) Review the question carefully and draw a schematic diagram of the movement process of the object.

(2) Clarify the research object, clarify the known quantities and the quantities to be sought.

(3) Specify the positive direction (generally take the direction of the initial velocity v0 as the positive direction) and determine the positive and negative of each vector.

(4) Choose the appropriate formula to solve.

(5) Judge whether the obtained result is consistent with the actual situation, and explain the direction of the physical quantity sought based on the positive or negative result.

A slider starts from rest and accelerates downwards from the top of the slope (long enough). The speed at the end of the 5th s is 6 m/s. Try to find:

(1)Velocity at the end of 4 s.

(2) Displacement within 5 s after movement.

(3) Displacement within the 5th s.

Method summary

Basic methods for cleverly selecting kinematics formulas

The formula involves a total of five physical quantities v0, v, a, t, and x, and each formula contains four quantities. Therefore, by clarifying three quantities, the other two quantities can be found. Proper selection of the formula can achieve twice the result with half the effort. ,Methods as below:

[Exercise to achieve standards]

1. A particle moves in a straight line at a uniform speed. The displacement in the 3rd s is 12 m, and the displacement in the 5th s is 20 m. Find:

(1) The initial velocity and acceleration of the particle.

(2) The displacement of the particle within 5 s.

2. A skier slides down an 85 m long slope at a constant speed. The initial speed is 1.8 m/s and the final speed is 5.0 m/s. How long does it take the skier to pass this slope?

Application of Corollary to Uniform Speed ​​Linear Motion

average speed formula

Content: The average speed of an object moving in a straight line at a uniform speed during a period of time t is equal to the instantaneous velocity at the middle moment of this period of time, and is also equal to half of the sum of the velocity vectors at the beginning and end of this period of time. That is v-=v0+v2=vt2

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For more information about the PPT courseware "Research on Linear Motion at Uniform Speed ​​and Inference of Linear Motion at Uniform Speed", please click the Research on Linear Motion at Uniform Speed ​​ppt Inference of Linear Motion at Uniform Speed ​​ppt tag.

"End of Chapter Review Lesson" Research on Uniform Speed ​​Linear Motion PPT:

"End of Chapter Review Course" Research on Uniform Speed ​​Linear Motion PPT Consolidation Layer Knowledge Integration [Core Quick Filling] 1. Laws of uniformly variable linear motion (1) Speed ​​formula: _________. (2) Displacement formula: _________. (3) Speed-displacement relationship formula: _________. 2. uniform..

"Optimization Summary of this Chapter" Research on Uniform Speed ​​Linear Motion PPT:

"Optimization Summary of this Chapter" Research on Uniformly Variable Speed ​​Linear Motion PPT Integrate and Improve Common Methods for Obtaining Uniformly Variable Speed ​​Linear Motion Since there are many formulas in the kinematics part, and the formulas are related to each other, some of the questions in this chapter can often be solved in one question Many solutions. When solving problems...

"Application of Laws of Uniformly Variable Speed ​​Linear Motion" Research on Uniformly Variable Speed ​​Linear Motion PPT courseware:

"Application of the Laws of Uniformly Variable Speed ​​Linear Motion" PPT courseware for the study of uniformly variable speed linear motion Part 1 Contents: [Learning Objectives] 1. Master the two basic formulas of uniformly variable speed linear motion. 2. Master the three average speed formulas and their applicable conditions, and be able to apply the average speed formula...

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Update Time: 2024-10-27

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