решения курсовых (семестровых) работ из задачника / Динамика / d01_22

mx = xi1 -

xi1 = G sinα − F

-

F

= f × N = G × f × cocα

G = mg -

mx = mg sinα = gf cosα

x1 = g(sin α − f cosα )

:

x

= g(sinα − f cosα)t + c

1

1

x

1

= g(sinα − f cosα) t 2

2

+ c t + c

2

1

t0 = 0; x10

= c1 = VA = 0;

x10

= 0 = c2 ; t =τ ; x1 = l ; x1 = VB

VB = g(sin α − f cosα)τ

l = g(sin α − f cosα)τ

2

τ 2

2

f = 2(sinα

−

l

) /τ 2

cosα = 0,28

2

g

mx = 0

my = mg

:

y = gt + c

5

x = c3

x = c3t + c4

y = gt 2 / 2 + c5t + c6

:

x0 = 0 c4 = 0

y0 = 0 c6 = 0

x0 = VB cosα = c3 = 7,07

y0 =VB sin α = c5 =

x = 7,07t

9,8t

2

- !.

y =

+ 7,07t

2