1. Bhokisi re uremu 5 kg iri mundege yakatsamira pakona 30oBhokisi racho rinotsigirwa netambo. Sarudza simba rekumanikidza (T) uye simba remazuva ose (N)!
mhinduro
∑Fx = 0
T – w chivi 30o = 0
T = w chivi 30o
T = (5 kg)(9.8 m/s2) chivi 30o
T = (49)(0.5)
T = 24.5 Newton
∑Fy = 0
N – w cos 30o = 0
N = w cos 30o
N = (49)(0.87)
N = 43 Newton
2. Zvinhu zviviri zvine huremu m1 = m2 = 2 kg, yakabatana netambo isina huremu pamusoro pepure isina kukweshana. Tsvaga simba rekukwesha T1 uye T2.
mhinduro
(a) Dhayagiramu yemuviri wakasununguka yechinhu 1 (b) Dhayagiramu yemuviri wakasununguka yechinhu 2
Shandisa mutemo wekutanga waNewton pakupikisa 1:
∑Fy = 0
T1 - w1 = 0
T1 = w1 = m1 g = (2 kg)(9.8 m/s2) = 19.6 N
Shandisa Mutemo wekutanga waNewton kuramba 2:
∑Fy = 0
T2 - w2 = 0
T2 = w2 = m2 g = (2 kg)(9.8 m/s2) = 19.6 N
T1 =T2 = 19.6N.
3. Chinhu che uremu wA = 30 N uye chinhu chinorema wB = 40 N, zvinosungirirwa netambo yakareruka inopfuura nepamusoro pepulley isina kukweshana yehukuru husina kukosha. Sarudza coefficient yehukuru hwepamusoro kukweshana kwemamiriro ezvinhu pakati pe wB uye pamusoro wakakotama, kana hurongwa hwacho hwakamira.
mhinduro
(a) Dhayagiramu yemuviri wakasununguka wechinhu wA (b) Dhayagiramu yemuviri wakasununguka wechinhu wB
Shandisa mutemo wekutanga waNewton pakupikisa wA munzira yakatwasuka (y):
∑Fy = 0 (hapana kukurumidza munzira yakatwasuka)
T – wA = 0
T = wA = 30 Newton
Shandisa mutemo wekutanga waNewton pakupikisa wB munzira yakatwasuka (y) :
∑Fy = 0
N – wB kusvika 45o = 0
N = wB kusvika 45o = (40)(0.7) = 28 Newton
Shandisa mutemo wekutanga waNewton pakupikisa wB munzira yakatwasuka (x):
∑Fx = 0
Fk +wB pasina 45o -T = 0
μs N + wB pasina 45o -T = 0
μs (28) + (40)(0.7) – 30 = 0
μs (28) + 28 – 30 = 0
μs (28) = 30 - 28
μs (28) = 2
μs = 2/28
μs = 0.07
Muyero wekukweshana kwakanyanya pakati pe wB uye pamusoro wakakombama = 0.07.
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