1. Bhokisi rine huremu hwe5 kg riri padenderedzwa rakanamira pakona ye30 o . Bhokisi racho rinotsigirwa netambo. Sarudza simba rekumanikidza (T) uye simba rakajairika (N)!
mhinduro
∑Fx = 0
T – w sin 30 o = 0
T = w chivi 30 o
T = (5 kg)(9.8 m/s 2 ) chivi 30 o
T = (49)(0.5)
T = 24.5 Newton
∑ F y = 0
N – w cos 30 o = 0
N = w cos 30 o
N = (49)(0.87)
N = 43 Newton
2. Zvinhu zviviri zvine huremu m 1 = m 2 = 2 kg, zvakabatanidzwa netambo isina huremu pamusoro pepure isina kukweshana. Tsvaga masimba ekukweshana T 1 naT 2.
mhinduro
(a) Dhayagiramu yemuviri wakasununguka yechinhu 1 (b) Dhayagiramu yemuviri wakasununguka yechinhu 2
Shandisa mutemo wekutanga waNewton pakupikisa 1:
∑ F y = 0
T 1 – w 1 = 0
T 1 = w 1 = m 1 g = (2 kg)(9.8 m/s 2 ) = 19.6 N
Shandisa mutemo wekutanga waNewton pakupikisa 2:
∑ F y = 0
T 2 – w 2 = 0
T 2 = w 2 = m 2 g = (2 kg)(9.8 m/s 2 ) = 19.6 N
T 1 = T 2 = 19.6 N.
3. Chinhu chinorema w A = 30 N uye chinhu chinorema w B = 40 N, zvinosungirirwa netambo yakareruka inopfuura nepapulley isina kukweshana yehukuru hushoma. Sarudza coefficient yekukwirirana kwakanyanya pakati pe w B nenzvimbo yakatsamira, kana sisitimu iri pakadzikama.
mhinduro
(a) Dhayagiramu yemuviri wakasununguka wechinhu w A (b) Dhayagiramu yemuviri wakasununguka wechinhu w B
Shandisa mutemo wekutanga waNewton kuti urambe w A nenzira yakatwasuka (y):
∑ F y = 0 (hapana kumhanyisa munzira yakatwasuka)
T – w A = 0
T = w A = 30 Newton
Shandisa mutemo wekutanga waNewton kuti urambe w B nenzira yakatwasuka (y) :
∑ F y = 0
N – w B cos 45 o = 0
N = w B cos 45 o = (40)(0.7) = 28 Newtons
Shandisa mutemo wekutanga waNewton kuti urambe w B munzira yakatwasuka (x):
∑ F x = 0
F k + w B sin 45 o – T = 0
μ s N + w B chivi 45 o – T = 0
μ s (28) + (40) (0.7) - 30 = 0
μ s (28) + 28 – 30 = 0
μ s (28) = 30 – 28
μ s (28) = 2
μ s = 2 / 28
μ s = 0.07
Muyero wekukweshana kwakanyanya pakati pe w B nepamusoro penzvimbo yakatsamira = 0.07.
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