"Related Corollaries of Uniformly Variable Speed ​​Linear Motion" Research on Uniformly Variable Speed ​​Linear Motion PPT

Description

"Related Corollaries of Uniformly Variable Speed ​​Linear Motion" Research on Uniformly Variable Speed ​​Linear Motion PPT

The first part of the content: [Learning literacy·clear goals]

Physical concepts:

1. Master the average speed formula of uniform linear motion and be able to perform relevant calculations.

2 will derive the proportional formula for uniformly variable linear motion with an initial velocity of zero.

3. Be able to derive the displacement difference formula Δx = aT2 and use it to answer related questions.

PPT related inferences about linear motion with uniform speed, part 2: cooperative exploration to overcome difficult problems

The average speed formula of uniformly variable linear motion

Three average speed formulas and applicable conditions

1.v=st, applicable to all movements.

2.v＝v0＋v2, suitable for uniform speed linear motion.

3.v=vt2, that is, the average speed within a period of time is equal to the instantaneous speed at the middle moment during this period, which is suitable for uniform linear motion.

[Example 1] The object first makes a uniformly accelerated linear motion with an initial velocity of zero, the acceleration a1 = 2 m/s2, accelerates for a period of time t1, and then continues to make a uniformly decelerated linear motion until the speed reduces to zero. It is known that the entire motion process takes Time t=20 s, the total displacement is 300 m, then the maximum speed of the object is ()

A. 15 m/s　B． 30 m/s

C. 7.5 m/s D． Unable to solve

For training

1. The average speed of a particle moving at a uniform speed along a straight line in the first 0.5 s is 2.45 m/s greater than its average speed in the first 1.5 s. Taking the direction of movement of the particle at the initial moment as the positive direction, then the particle's The acceleration is ()

A. 2.45 m/s2 B. -2.45 m/s2

C. 4.90 m/s2 D. -4.90m/s2

2. (Multiple choices) A ​​particle starts from rest and makes a uniformly accelerated linear motion. The displacement in the first 3 s is 2 m, then ()

A. The average speed during these 3 s is 1.2 m/s

B． The instantaneous speed at the end of the 3rd s is 2.2 m/s

C. The acceleration of the particle is 0.6 m/s2

D． The acceleration of the particle is 0.8 m/s2

The proportional formula for uniformly accelerated linear motion with an initial velocity of zero

1. Uniformly accelerated linear motion with an initial velocity of 0, divided equally by time (assuming equal time intervals are T), then:

(1) The ratio of the instantaneous speeds at the end of T, the end of 2T, the end of 3T, ..., and the end of nT

v1:v2:v3:…:vn=1:2:3:…:n.

(2) Ratio of displacement within T, within 2T, within 3T, ..., nT

s1:s2:s3:…:sn=12:22:32:…:n2.

(3) The ratio of the displacements within the first T, the second T, the third T,..., the nth T

s1′:s2′:s3′:…:sn′=1:3:5:…:(2n-1).

2. Proportional formula divided equally by displacement (assuming equal displacement is s)

(1) The instantaneous velocity ratio v1:v2:v3:...:vn=1:2:3:...:n when passing through the displacements of the first s, the first 2s, the first 3s,..., the first ns.

(2) The ratio of the time taken to pass through the displacement of the first s, the first 2s, the first 3s,..., the first ns t1:t2:t3:...:tn=1:2:3:...:n.

(3) The ratio of time taken to pass the same continuous displacement

t1′:t2′:t3′:…:tn′=1:(2-1):(3-2):…:(n-n-1)．

PPT related inferences about linear motion with uniform speed, the third part: reaching the standard and solidifying the double base in class

1. For an object that starts from rest and moves in a straight line with uniform acceleration, the ratio of the average speed in the 1st s, the 2nd s, and the 3rd s is ()

A. 1:3:5 B． 1:4:9

C. 1:2:3 D. 1:2:3

2. (Multiple choices) The object starts from rest and moves in a straight line with uniform acceleration. The displacement in the 3 s is 3 m, then ()

A. The average speed in the 3rd s is 3 m/s

B． The acceleration of the object is 1.2 m/s2

C. The displacement in the first 3 s is 6 m

D． The speed at the end of 3 s is 3.6 m/s

3. (Multiple choices) A ​​particle moves in a straight line with uniform acceleration. The displacement in the 3rd s is 2 m, and the displacement in the 4th s is 2.5 m. Then the following statement is correct ()

A. The displacement in the second s is 2.5 m

B． The acceleration of the particle is 0.125 m/s2

C. The instantaneous speed at the end of the 3rd s is 2.25 m/s

D． The speed at the end of the 4th s is 2.75 m/s

4. A particle moves in a straight line at a uniform speed, with an initial velocity v0 = 2 m/s, and a displacement of 20 m in 4 s. Find:

(1) The average velocity of the particle within 4 s;

(2) The velocity of the particle at the end of 4 s;

(3) The velocity of the particle at the end of 2 s.

Keywords: Free download of PPT courseware for compulsory course 1 of high school physics in Lu Ke version, PPT download of relevant inferences of linear motion with uniform speed, PPT download of research on linear motion of uniform speed, .PPT format;

For more information about the PPT courseware "Research on Uniform Speed ​​Linear Motion and Related Inferences on Uniform Speed ​​Linear Motion", please click the Research on Uniform Speed ​​Linear Motion ppt Related Inferences on Uniform Speed ​​Linear Motion 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...

File Info

Update Time: 2024-10-02

This template belongs to Physics courseware Lu Ke Edition High School Physics Compulsory Course One industry PPT template

Preview