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# Fisika - Momen Gaya & Momen Inersia

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### Fisika - Momen Gaya & Momen Inersia

1. 1. Tugas FisikaMomen Gaya & Momen Inersia Ramadhani Sardiman XI IPA 3 SMAN 3 Padang
2. 2. 1. Susunan 3 buah massa titik seperti gambar berikut! Jika m1 = 1 kg, m2 = 2 kg dan m3 = 3 kg, tentukan momen inersia sistem tersebut jika diputar menurut : a. Poros P b. Poros Q If m1 = 1 kg, m2 = 2 kg and m3 = 3 kg, calculate the moment of inertia if it is rotated on : a. Axis P b. Axis Q Answer : Poros P : Poros Q :2. Empat buah gaya masing-masing F1 = 10 N, F2 = 10 N, F3 = 10 N, F4 = 10 N, dan panjang AB = BC = CD = DE = 1 m. Dengan mengabaikan berat batang AE, tentukan momen gaya yang bekerja pada batang dan arah putarannya jika : a. Poros putar di titik A b. Poros putar di titik D Four force is applied on an object F1 = 10 N, F2 = 10 N, F3 = 10 N, F4 = 10 N, and the length of AB = BC = CD = DE = 1 m. If the weight of of AE is ignored, determine the torsion that is applied on object AE and the direction it rotates, if: a. The axis is located at point A b. The axis is located at point D
3. 3. Answer : Poros putar di titik A Putaran searah jarum jam. Poros putar di titik D Putaran berlawanan arah dengan jarum jam.3. Pada sebuah benda bekerja gaya 20 N seperti pada gambar. Jika titik tangkap gaya berjarak 25 cm dari titik P, berapakah besar momen gaya terhadap titik P? A force of 20 N is applied to an object. If the force is 25 cm away from the pont P. The torsion towards point P is… Answer : F = 20 N, r = 25 cm, dan θ = 150°. τ = r F sin θ = (0,25 cm)(20 N)(sin 150°) = (0,25 cm)(20 N)( ½ ) = 2,5 Nm4. Sebuah pintu dengan lebar 80 cm, didorong di bagian tengahnya dengan gaya 200 N. Hitung besar momen gaya terhadap sumbu putar yang melalui engsel tersebut. A door with a width of 80 cm, is pushed in the middle with a force of 200 N. Calculate the torsion. Answer : τ = r F sin α = 40.10-2 m . 200 N . sin 90o = 80 Nm
4. 4. 5. Tiga buah benda masing-masing bola pejal massa 5 kg, silinder pejal massa 2 kg, batang tipis massa 0,12 kg, dan D = 2 m. Tentukan momen inersia masing- masing benda dengan pusat benda sebagai porosnya! Three items of solid ball with a mass of 5 kg, solid cylinder with a mass of 2 kg, thin rod with a mass of 0.12 kg, and D = 2 m. Calcuate the moment of inertia each object with the axis at the center of the spere! Answer : Bola pejal Silinder pejal Batang tipis6. Sebuah batang B dengan panjang AB = 13m, AC = 4m, DB = 4m, F1 = 4N, F2 = 6N, F3 = 4N dan F4 = 6N. Besarnya momen gaya terhadap sumbu B adalah …. A stick with a length of AB=13m, , AC = 4m, DB = 4m, F1 = 4N, F2 = 6N, F3 = 4N dan F4 = 6N. The torsion that is applied toward axis B is ....
5. 5. Answer :7. Jika diketahui r1 = r2 = 6cm, maka besarnya torsi total yang bekerja terhadap titik O adalah …. If r1 = r2 = 6cm, the total torsion that is working towards point O is …. Answer :8. Batang AC yang massanya diabaikan dikenai 3 gaya dengan besar dan arah seperti gambar. Besar momen total terhadap titik B adalah .... An object AC which mass is ignored has 3 force applied to it. The total torsion that is working towards point B is… Answer :
6. 6. 9. Tiga buah partikel masing-masing m1 = 0,6 kg; m2 = 0,2 kg; m3 = 0,4 kg. Ketiga partikel itu terletak pada ujung-ujung segitiga ABC. Hitung momen inersia benda, jika sumbu putar melalui BC! Three particles which has m1 = 0,6 kg; m2 = 0,2 kg; m3 = 0,4 kg. The three particle which is located at the end of each triangle ABC. Calculate the moment of inertia of the object, if the axis is located at point BC! Answer : Sumbu putar melalui BC, berarti Iac = 010. Sebuah partikel bermassa 0,5 kg melakukan gerak rotasi dan memiliki momen inersia sebesar 12,5 x 10-2 kgm2. Jari-jari lintasan partikel tersebut adalah … Answer : M = 0,5 kg I = 12,5 x 10-2 kgm2 r = .…? I = m.r2 r2 = r2 = r2 = 0,25 r = 0,5 m r = 50 cm