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

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

Part One Content: [Learning Objectives]

1. Master the two basic formulas of uniformly variable linear motion.

2. Master the three average speed formulas and their applicable conditions, and be able to apply the average speed formula to solve related problems.

3. Be able to derive Δx=aT2 and use it to solve related problems.

PPT on the application of the law of uniformly variable linear motion, part 2: cooperative exploration to overcome difficult problems

Two basic formulas for uniform linear motion

1. Speed ​​formula: v＝v0＋at.

2. Displacement formula: x=v0t+12at2.

3. Issues to note when applying

(1) v0, v, a, and x in the basic formula are all vectors. In linear motion, if the positive direction is specified, they can all be represented by algebraic values ​​with positive and negative signs, converting vector operations into algebraic operations. Under normal circumstances, the direction of the initial velocity is taken as the positive direction. All physical quantities in the same direction as the initial velocity take positive values, and all physical quantities in the opposite direction to the initial velocity take negative values.

(2) The two basic formulas contain five physical quantities, which can be "know three and find two".

(3) Application of the reverse thinking method: a uniformly decelerating linear motion with a terminal velocity of 0 can be viewed in reverse as a uniformly accelerated linear motion with an initial velocity of 0.

(4) The basic idea for solving kinematics problems: review the problem → draw a process sketch → judge the nature of motion → select the positive direction (or select the coordinate axis) → use the formula to form an equation → solve the equation, and discuss the results if necessary.

[Example 1] On a straight road with a speed limit of 50 km/h, a car brakes in an emergency. After braking, the wheels slide on the road and leave a 9.0 m long straight brake mark. From the surveillance video, it is known that the time from braking to stopping is 1.5 s. Please calculate the speed of the car before braking based on the above data, and determine whether the car is speeding.

The average speed formula of uniformly variable linear motion

1.v=xt applies to all motions.

2.v＝v0＋v2 is 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 2] 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 the 4th second;

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

Displacement difference formula Δx=aT2

1. In uniform speed linear motion, the difference in displacement within consecutive equal times T is a constant value, that is, Δx=x2-x1=aT2.

2.Application

(1) Determine whether the object is moving in a straight line at a uniform speed

If Δx=x2-x1=x3-x2=...=xn-xn-1=aT2 holds,

Then a is a constant, indicating that the object moves in a straight line at a uniform speed.

(2) Find the acceleration

Using Δx=aT2, we can obtain a=ΔxT2.

PPT on the application of the law of uniform speed linear motion, the third part: reaching the standard in class and solidifying the double base

1. A bullet is shot into a wall with a speed of v but does not penetrate out. The depth of the shot is x. If the bullet moves in a straight line at a uniform speed when traveling through the wall, the time it takes for the bullet to move inside the wall is ()

A.xv　B.2xv　C.2xv　D.x2v

2. An object moving in a straight line at a uniform speed in the due east direction has a displacement of 8 m in the 3 s and a displacement of 5 m in the 5 s. The correct description of the acceleration of the object is ()

A. The size is 3 m/s2 and the direction is due east.

B． The size is 3 m/s2 and the direction is due west.

C. The size is 1.5 m/s2 and the direction is due east.

D． The size is 1.5 m/s2 and the direction is due west.

3. An object rolls down from rest at a uniform speed from the top of the slope. It takes 1 s to reach the midpoint of the slope and the speed is 2 m/s. The following statement is correct: ()

A. The length of the slope is 1 m

B． The length of the slope is 2 m

C. The total time the object moves on the slope is 2 s

D． The speed when reaching the bottom of the incline is 4 m/s

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

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

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"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...

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"Relevant Inferences of Uniformly Variable Speed ​​Linear Motion" Research on Uniformly Variable Speed ​​Linear Motion PPT Part One Content: [Learning Literacy Targets] Physical Concepts: 1. Master the average speed formula of uniformly variable speed linear motion, and be able to perform relevant calculations. 2. Be able to derive The initial velocity is zero..

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Update Time: 2024-10-05

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

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