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.

- , , ( ) .

:

.

, ( ).

.

A = F * sA

F ( )

s

[J].

1J = 1N * 1m1J = 1Nm :

1J 1N 1m, .

:

- 1kJ = 1000J = 103J - 1MJ = 1 000 000J = 106J - 1GJ = 1 000 000 000J = 109J .

:

F :

Fn - Fp - - - . ( ) .

Fg=mg

A=mgh

, .

-

- ( , , )

, . :

-

-

s

F

F

Fn

Fp

F

Fg

h

Ftr

_1457030080.unknown

_1457030205.unknown

_1383321126.unknown

_1383321236.unknown