Rectilinear uniformly accelerated motion. Presentation on the topic "Movement of a body during rectilinear uniformly accelerated motion without initial speed (along the x axis)" Presentation on the topic displacement during uniformly accelerated motion
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Physics 9th grade
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Uniformly accelerated motion is a motion in which the speed of a body changes equally over equal periods of time.
Acceleration is a quantity equal to the ratio of the change in speed to the period of time during which this change occurred.
S x
S x
Task No. 1. With what acceleration does a racing car move if its speed increases from 144 to 216 km/h in 6 s?
Problem No. 2 How long will it take the rocket to reach its first escape velocity of 7.9 km/s if it moves with an acceleration of 50 m/s 2 ?
Task No. 3 Calculate the length of the runway if the plane's speed is 300 km/h and the acceleration time is 40 s.
Task No. 4
The speed of the racing car at the start of acceleration is 10 m/s, acceleration 5 m/s 2 . Determine the distance traveled by the car in 10 s after the start of movement. What is the speed of the car at the end of the tenth second of acceleration?
Problem No. 5 The braking distance of a car moving at a speed of 50 km/h is 10 m. What is the braking distance of the same car at a speed of 100 km/h?
Problem No. 6 What is the length of the plane's run when landing if its landing speed is 140 km/h and the acceleration during braking is 2 m/s 2 ?
Problem No. 7 With uniformly accelerated motion with an initial speed of 5 m/s, the body traveled 20 m in 3 s. With what acceleration did the body move? What is its speed at the end of the third second?
1.What types of movement do you know? 2. Define each of them. 3.What quantities characterize these types of movement? 4.What is the acceleration of uniformly accelerated motion called? 5.What is uniformly accelerated motion? 6.What does the acceleration module show? 7. The train leaves the station. What is the direction of its acceleration? 8. The train begins to slow down. What are the directions of its speed and acceleration? Frontal survey Think and answer!
Vxvx t vxvx -vx-vx 2 1 Characterize the movements of material points whose v x (t) graphs (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 module and the distance traveled? 1. A O SxSx SxSx Solve orally Fig. 1
Solve t O orally. Figure 2 schematically shows graphs of the speed of bodies versus time. What do these movements have in common and how do they differ? vxvx 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? vxvx A B C D t O vxvx vxvx 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? vxvx t O A t Solve orally Fig. 4
Graph of the projection of the velocity vector of a body moving with constant acceleration t vxvx v ox axtaxt 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
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Problems (at the board) The kinematic law of train motion along the Ox axis has the form: x = 0.2t 2. Is the train accelerating or decelerating? 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. 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 projection of the initial velocity and acceleration. What is the coordinate of the ball and the projection of its speed at the end of the 5th second? 9.
Uniformly accelerated motion Physical quantity Graph Velocity Acceleration Displacement Coordinate B A C DE FGH Think and find the correspondence x Fig. 10
Thanks for the work! Homework § 7-8, page Exercise 7 (1), ex. 8 (2) (Peryshkin A.V., Gutnik E.M. Physics. 9th grade. - M.: Bustard, 2007). Thank you for the lesson!
