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Механично движение PowerPoint PPT Presentation


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Равноускорително движение. Механично движение. Равнозакъснително движение. Действие на сили. Свободно падане. Механично движение. Втори принцип. Трети принцип. Първи принцип. Отправно тяло.

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Механично движение

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,


, .

m/s km/h


  • :

    - /.1/

    -

    /. 2/


  • -

    - ,



S=V.t

V=const



  • 50km/h, 2 60 km/h. ?


:

t1=3h, V1=50 km/h, t2=2h, V2=60 km/h

:

V=?

:

V.=/S1+S2/:/t1+t2/

V. = 54km/h


3,6

m/skm/h

:3,6

:1000

M km

1000

:3600

S h

x3600

20m/s = 72 km/h

200m = 0,2 km

72 s=0,02 h



,


  • ,

  • m/s2


V= V0 + at

V= at




. .


:/ / / /


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/

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!


! !!!


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V=V0-at


  • :


v, m/s

A

B

8

E

4

C

D

0

t, s

15

10

5

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1. ;

2. ;

3. ;

4. ;

5. ;

6. .


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, , - , g . .

g=9,8 m/s2


V =gt

(1) :

(2) :


:


.

  • 1. , :

  • / /

  • / /


.2. 20 . , :

/ /

/ /


3. 10 10min. ?

/ 1km/h / 6 km/h

/ 60 km/h / 100 km/h


4. :

/ /

/

/


5. 45 , . ?

/ 2 s / 3 s / 4,5 s / 9 s


!


!


!

!


!


!

!

S= 10 km,

t= 10min=1/6h ,

v= ?

V= 10:1/6

V= 10.6

V= 60 km/h


!


!

-


!


!

S = 45 m

t = ?

S= 1/2.gt2

t2=2S/g

t2= (2.45):10

t2=90:10

t2=9

t=3s

.


!


1. , 36 km/h, 4m/s2. ?

2. . t s?


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