Presentation on the topic of movement under uniformly accelerated motion. Moving during uniformly accelerated motion

Slide 2

Learning to solve problems

When x0 =0, x=s, v0x=0, ax=a From the basic equation We obtain For time t = 1, 2, 3…. n (c) we get s1: s2: s3... = 1:4: 6... Where s1, s2, s3 is the path traveled in one second, in two seconds, etc. 1.

Slide 3

Let s(1) be the path traveled by the body in one second, s (2) be the path traveled by the body in the second second, in the third, etc. s (1): s (2): s (3)… = 1: 3: 5… We must remember: s1 = s(1) The formula 2t -1 allows you to determine any odd number that corresponds to the magnitude of the displacement vector per n-second movement, So for s (5) there corresponds an odd number: 2 5 -1 =9

Slide 4

Problem No. 1 (A.V. Peryshkin) A car, moving uniformly accelerated from a state of rest, covers 6.3 m in the fifth second of acceleration. What speed did the car develop by the end of the fifth second from the start of movement? We draw up the standard: Given: SI Solution: “Given” and “SI” write down yourself

Slide 5

Solution

Let's understand the term: “in the fifth second”, “by the end of the fifth second”. The first means the path traveled by the car in the fifth second of movement s(5), and the second means the path traveled by the car in five seconds of movement s 5 We solve for s1, since this path traveled by the body in 1 second is equal to the path in the first second s(1) We determine the relations : s1: s (5) = 1: 9 or s1: 6.3 = 1: 9, we get that s1 = 6.3: 9 = 0.7 m. We apply formula 1. We get: . 5. We substitute the values ​​s1 =0.7 m into the formula, we obtain that a =1.4 m/s2.

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Slide captions:

Movement during rectilinear uniformly accelerated motion, grade 9

What types of movement do you know? Define each of them. What quantities characterize these types of motion? What is acceleration of uniformly accelerated motion called? What is uniformly accelerated motion? What does the acceleration module show? The train leaves the station. What is the direction of its acceleration? The train begins to slow down. What are the directions of its speed and acceleration? Frontal survey Think and answer!

v x t v x - v x 2 1 Characterize the movements of the material points whose graphs of v x (t) (1 and 2) are presented in the figure. How to determine from these graphs the projection of the displacement of a point on the x-axis, its magnitude and the distance traveled? No. 1. A O S x S x Solve orally Fig. 1

Solve orally t O 2 1 No. 2. Figure 2 schematically shows graphs of the dependence of the speed of bodies on time. What do these movements have in common and how do they differ? v x Fig. 2

Decide orally which part of the graph of speed versus time (Fig. 3) corresponds to uniform motion, uniformly accelerated with increasing speed, uniformly accelerated with decreasing speed? No. 3 . v x A B C D t O v x v x Fig. 3

Figure 4 schematically shows graphs of the speed of bodies versus time. What do all movements have in common and how do they differ? v x t O 1 2 3 4 A t No. 4 . Solve orally Fig. 4

Graph of the projection of the velocity vector of a body moving with constant acceleration t v x v ox a x t D C M B O Fig. 14 (b), page 29 (Peryshkin A.V. “Physics-9”) D B The area under the velocity graph is numerically equal to the displacement. Therefore, the area of ​​the trapezoid is numerically equal to the displacement. Graph of the projection of the velocity vector of a body moving with constant acceleration Fig. 5

Remember! Equations for determining the projection of the displacement vector of a body during its rectilinear uniformly accelerated motion (1) (2) (3) ! ! (1)

Movement of a body during rectilinear uniformly accelerated motion without initial speed. (1) (2) (3)

S x S x t t O O Graph of the projection of the body’s displacement vector versus time (Fig. 6), if the body moves with constant acceleration. Remember! ! Rice. 6

x t - x 0 O Remember! Graph of the dependence of the coordinates of a body moving with constant acceleration on time (Fig. 7). ! Rice. 7 Remember!

What is the displacement of a body if the graph of its speed versus time is shown schematically in Figure 8? v x O t a x t t v x Think and answer! No. 5. No. 5. Fig. 8

x 0 x x t t 0 Remember! ! x 0 - x 0 a x >0 a x

Problems (at the board) The kinematic law of train motion along the Ox axis has the form: x= 0.2 t 2. Is the train accelerating or slowing down? Determine the initial velocity projection and acceleration. Write down the equation for the projection of velocity onto the Ox axis. Graph the projections of acceleration and velocity. No. 8. The position of a soccer ball rolling along the Ox axis along the field is given by the equation x=10 + 5t – 0.2t 2 . Determine the initial velocity projection and acceleration. What is the coordinate of the ball and the projection of its speed at the end of the 5th second? No. 9.

Uniformly accelerated motion Physical quantity Graph Speed ​​1 - 5 - Acceleration 2 - 6 - Displacement 3 - 7 - Coordinate 4 - 8 - B A C D E F G H Think and find the correspondence 1 2 3 6 8 7 4 5 No. 7. x Fig. 10

Reflection Last name, first name What did you know? What did you learn? What do you disagree with? What's not clear? (filling out a conceptual table) Exchange opinions, quotes from tables with reflection.

Thanks for the work! Homework § 7-8, pp. 28-33. Exercise 7 (1), exercise 8 (2) (Peryshkin A.V., Gutnik E.M. Physics. 9th grade. - M.: Bustard, 2007). Thank you for the lesson!

On the topic: methodological developments, presentations and notes

Presentation with animation for a lesson in 9th grade. Laboratory work No. 1. Study of uniformly accelerated motion without initial velocity

This presentation, pptx format, consists of 16 slides, contains animation of the experiment; detailed progress of work; contains control questions; questions of updating knowledge, homework...

Movement of a body during rectilinear uniformly accelerated motion. No initial speed

Movement of a body during rectilinear uniformly accelerated motion. Without initial speed. Movement of a body during rectilinear uniformly accelerated motion. Without initial speed...

“Solving acceleration problems” - Traveling with acceleration to the Arctic Circle. Calculate the acceleration of the body using the formula. Travel to the Far North. Graph of velocity projection versus time. Testing. Knowledge of acceleration and motion with constant acceleration. What quantity is called the acceleration of a body during uniformly accelerated motion?

“Acceleration during uniformly accelerated motion” - Graph. Dependencies between quantities. Starting speed. Graphic representation of movement. Speed. Body speed. Uniformly accelerated motion. Movement. Acceleration. Body. Uneven movement. Moving during uniformly accelerated motion. Vectors.

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““Uniformly accelerated motion” 9th grade” - Describe the nature of the body’s movement. Building graphs. Let's study uniformly accelerated motion by changing the initial data. We repeated and consolidated knowledge from the physics course. Model study. Solution in spreadsheets. We are building a time axis. Path calculation. Speed ​​calculation. Modeling uniformly accelerated motion in spreadsheets.

“Free fall grade 9” - Definition: A body is thrown vertically upward with an initial speed of 30 m/s. What formulas describe the free fall of bodies? Movement of a body vertically upward: Acceleration of free fall at different latitudes: How long would it take for a load to fall from the height of the Ostankino TV tower (540 m)? What motion is called free fall?

“Movement during uniformly accelerated motion” - The car increased its speed from 20 m/s to 30 m/s. Determine the movement of the car in 10 s. A car is moving along the highway at a speed of 20 m/s. Determine the movement of the car in 10 s. Equally slow motion. Moving during uniformly accelerated motion. To take off from the ground, the plane must gain a speed of 180 m/s.

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