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1 Εξοικείωση με την Τράπεζα Θεμάτων στο μάθημα της Φυσικής Α’ Λυκείου Επιμέλεια: Ομάδα Φυσικών 2014
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### Transcript of ΤΡΑΠΕΖΑ 2014 ΦΥΣΙΚΗ

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:

2014

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5259

) )

) 1 2F F F= +r r r

( ) ( )2 22 21 2F F F 4N 3N 5N= + = + =,

2FF ma a a 2,5m / sm

= = =

) B)

) .F =r

, . .

. :

t 0 =

9093

• 4

) )

) : = ( t1) / t1 = x1/t1 (1)

x1 = 12,5cm. (1) :

(1) => = (12,5cm)/5 cm/s => = 25cm/s

) )

) (t=0) = 0 , F = Fx = F >0. , : = F/m => = F/m > 0 (1). (1) t = 0 t = t3, , , .

9089

9089

• 5

) ().

) : s/m5s/m4

20

4,02

1,04

m10200

tS

111

2

1

1 ===

==

: s/m2s/m12

s1,010m10200

tS

11

2

1

2 ==

==

: 21 >

) )

) () (): UA + K = U + K = UA U = mgH mgh = mgH mgH/2 = mgH/2 K = U

10792

9005

• 6

) )

) F , .

.

) A)

) : E ... :

)(.

)(.w WW == mgh2

)(. = (1)

: E ... :

)Z(.

)H(.w WW == mgh2

)H(. = (2)

(1), (2): BA)H( .)( . KK ==

5119

9172

1wr

1Nr

Tr

• 7

) )

) :

SSS 21 ==

212

1

)1(

)2(

2

1

)2(

2

)1(

1

2

1

)2(

22

)1(

11

154

tStS

tS

tS

tS

tS

• 8

) )

) , .

) )

) . t=1s

t=0 t=1s. cm902

1180Ex. =

==

x=110cm. , .

x=90cm.

10840

• 9

) )

) (x=. t2) ( u0=0). :

21x a t u a t (I)2

= =

:

( )2(I)2 2 21 1 1K m u K m at K ma t (II)2 2 2

= = =

()

) )

) ,

. s/m15s2m30

tx

===

9015

10930

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) )

) , , .

u-t .

:

A0,9 160

x cm 72cm2

= =

:

B(20 180) 0,9

x cm 90cm2

+ = =

90cm 1s, 0,9s . .

10839

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9516 10853

• 12

5068

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5090 10824

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2

1

Fv

vr

1Nr

1wv

2wv

v

vr

r

2

1 v

r

1Nr

1wv

2wv

v

vTv

r

9093

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5102

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10840

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5226

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9447

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5512

• 21

10846

• 22

10850

• 23

9172

d

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Fr

yr

Nr

wr

Tr

xr

9005

4)

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10841

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9455

• 28

10828

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:

1) , F = 0 W F = 0 F = mg F = 1,210-2N

2) F = (1 + 5) 10-2 1,210-2 = (1 + 5) 10-2 1,2 = 1 + 5 5 = 0,2 = 0,04m/s

3) PF = F180 = -1,210-20,04W PF = -4,810-4W

4) = 0,02m/s, : F = (1 + 5) 10-2 F = (1 + 50,02) 10-2 = 1,110-2N

F = m W F = m mg F = m = 5/6 m/s2

10810

5082 10814

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9002

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10826

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1) : W = mg = 3200N

F = m W F = m = 0,1m/s2.

2) y = t2 y = 0,1202 m y = 20m

WF = Fy180 WF = 300020(-1)J WF = -60000J

P = WF/t = -3000W

3) 1 = t = 2m/s

h = h - y = 10m

: W = Ww= K mgh = m22 - m12 22 = 12 + 2gh 2 = 6m/s

4) 2 = 1 + g t t= (2 1)/g t=2,5s

t = t + t=22,5s