IPA Fisika 8

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Anjuprayudi
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• 1.

• 2.

• 3.

• 4.

• 5.

• 6.

Sebuah benda yang dilemparkan ke atas makin lama gerakannya makin lambat dan akhirnya berhenti. Yang menyebabkannya adalah . . . .

• A.

Gaya gravitasi

• B.

Tekanan oleh udara

• C.

gaya gesekan

• D.

Angin

A. Gaya gravitasi
Explanation
When an object is thrown upwards, it experiences a force called gravity that pulls it downwards. As the object moves higher, the force of gravity becomes stronger, causing the object to slow down until it eventually comes to a stop and starts falling back towards the ground. Therefore, the force of gravity is responsible for the object's decreasing speed and eventual stoppage.

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• 7.

Sebuah benda yang dilemparkan ke atas makin lama gerakannya makin lambat dan akhirnya berhenti. Yang menyebabkannya adalah . . . .

• A.

Gaya gravitasi

• B.

Tekanan oleh udara

• C.

gaya gesekan

• D.

Angin

A. Gaya gravitasi
Explanation
The correct answer is gaya gravitasi. When an object is thrown upwards, it experiences a force called gravity, which pulls it back towards the Earth. As the object moves higher, the force of gravity becomes stronger, causing the object to slow down. Eventually, the force of gravity overcomes the object's upward motion, causing it to stop and then fall back towards the Earth. This is why the object's motion slows down and eventually stops when thrown upwards.

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• 8.

Resultan dua gaya yang segaris dan berlawanan arah adalah . . . .

• A.

Selisih kedua gaya itu dan searah dengan gaya terkecil

• B.

Selisih kedua gaya itu dan searah dengan gaya terbesar

• C.

Jumlah kedua gaya itu

• D.

Pembagian kedua gaya itu

B. Selisih kedua gaya itu dan searah dengan gaya terbesar
Explanation
The correct answer is "selisih kedua gaya itu dan searah dengan gaya terbesar" because when two forces are collinear and opposite in direction, their resultant is the difference between the two forces and it acts in the direction of the larger force.

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• 9.

Apabila resultan gaya yang dialami suatu benda sama dengan nol, maka . . . .

• A.

Benda pasti diam

• B.

Benda bergerak akan berhenti

• C.

Benda yangb bergerak lurus beraturan akan tetap bergerak lurus beraturan

• D.

Benda diam akan diam, atau benda yang bergerak lurus akan tetap bergerak lurus beraturan

D. Benda diam akan diam, atau benda yang bergerak lurus akan tetap bergerak lurus beraturan
Explanation
When the resultant force acting on an object is zero, it means that all the forces acting on the object are balanced and cancel each other out. In this case, if the object is initially at rest, it will remain at rest because there is no net force to cause it to move. If the object is already in motion in a straight line with constant velocity, it will continue to move in that same direction with the same speed because the balanced forces do not cause any change in its motion. Therefore, the object will either remain at rest or continue moving in a straight line with constant velocity.

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• 10.

Resultan dua gaya yang segaris yang sama besar dan berlawanan arah adalah . . . .

• A.

Nol

• B.

Sama besar

• C.

Tidak nol

• D.

Tidak sama besar

A. Nol
Explanation
When two forces of equal magnitude and opposite direction act along the same line, they cancel each other out. This means that the net force or resultant force is zero. Therefore, the correct answer is "nol" which means zero in Indonesian.

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• 11.

Sebuah benda massanya 5.000 gram mendapat pengaruh percepatan gravitasi 10 m/s2. Berat benda tersebut sebesar . . . .

• A.

50 N

• B.

500 N

• C.

5.000 N

• D.

50.000 N

A. 50 N
Explanation
The weight of an object is equal to the mass of the object multiplied by the acceleration due to gravity. In this case, the mass of the object is given as 5,000 grams (or 5 kg) and the acceleration due to gravity is 10 m/s^2. Therefore, the weight of the object can be calculated as 5 kg x 10 m/s^2 = 50 N.

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• 12.

Sebuah benda beratnya 900 N, bila massa benda sebesar 180 kg, maka percepatan gravitasi di tempat tersebut adalah ....

• A.

5 N/kg

• B.

50 N/kg

• C.

500 N/kg

• D.

5.000 N/kg

A. 5 N/kg
Explanation
The weight of an object is equal to its mass multiplied by the acceleration due to gravity. In this case, the weight of the object is given as 900 N and the mass is given as 180 kg. By rearranging the formula, we can find the acceleration due to gravity by dividing the weight by the mass. 900 N / 180 kg = 5 N/kg. Therefore, the correct answer is 5 N/kg.

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• 13.

Dua buah gaya yang besarnya masing-masing 10 N ke kanan dan 10 N ke kiri bekerja segaris, maka resultan kedua gaya tersebut adalah . . . .

• A.

Nol

• B.

10 N

• C.

20 N

• D.

100 N

A. Nol
Explanation
The two forces of 10 N each, one to the right and one to the left, cancel each other out. Since they have equal magnitudes but opposite directions, their resultant is zero.

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• 14.

P tarik tambang melawan Q, P dengan gaya 250 N dan Q = 350 N. Resultan kedua gaya tersebut adalah . . . .

• A.

100 N kearah Q

• B.

100 N kearah P

• C.

600 kearah P

• D.

600 kearah Q

A. 100 N kearah Q
Explanation
The correct answer is 100 N kearah Q. This is because the resultant force is calculated by subtracting the smaller force from the larger force. In this case, 350 N - 250 N = 100 N. The direction of the resultant force is always towards the larger force, which is Q in this case. Therefore, the resultant force is 100 N kearah Q.

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• 15.

Resultan ketiga gaya pada ilustrasi  di bawah ini adalah . . .  .     " Benda ditarik kekiri dengan dua gaya masing - masing 5 N dan 10 N, kemudian         ditarik  kekanan dengan gaya sebesar 20 N "

• A.

5 N kekanan

• B.

5 N kekiri

• C.

35 N kekanan

• D.

35 N kekiri

A. 5 N kekanan
Explanation
The correct answer is 5 N kekanan because the object is being pulled to the left with two forces, one of 5 N and one of 10 N. However, it is also being pulled to the right with a force of 20 N. Since the force to the right (20 N) is greater than the combined force to the left (5 N + 10 N = 15 N), the net force on the object is 5 N to the right.

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• 16.

Dua gaya 15 N dan  9 N bekerja pada benda bermassa 3 kg seperti ditunjukkan pada ilustrasi  di bawah ini. Besar percepatan benda tersebut adalah . . . . " suatu benda dengan massa 3 kg, ditarik kekiri dengan gaya 9 N, kemudian ditarik   kekanan dengan gaya 15 N "

• A.

2 N/kg

• B.

0,2 N/kg

• C.

0,02 N/kg

• D.

0.002 N/kg

A. 2 N/kg
Explanation
The correct answer is 2 N/kg. This is because the net force acting on the object can be calculated by subtracting the force pulling to the left (9 N) from the force pulling to the right (15 N). The net force is then divided by the mass of the object (3 kg) to find the acceleration. In this case, the net force is 6 N (15 N - 9 N), and dividing this by 3 kg gives an acceleration of 2 N/kg.

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• 17.

Percepatan gravitasi di Bulan diperkirakan     percepatan gravitasi di Bumi. Jika berat Ronal di   Bumi adalah 480 N, beratnya di Bulan adalah . . . .

• A.

96 N

• B.

9,6 N

• C.

0,96 N

• D.

0,0096 N

A. 96 N
Explanation
The question states that the acceleration due to gravity on the Moon is estimated to be one-sixth of the acceleration due to gravity on Earth. Therefore, if Ronal's weight on Earth is 480 N, his weight on the Moon would be one-sixth of that, which is 80 N.

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• 18.

Suatu benda memiliki massa 500 gram ditarik dengan gaya 60 N, maka percepatan yang dialami  balok jika lantai dalam keadaan licin,  adalah . . . .

• A.

120 N/kg

• B.

12 N/kg

• C.

1,2 N/kg

• D.

0,12 N/kg

A. 120 N/kg
Explanation
When a force is applied to an object, it causes the object to accelerate. The acceleration can be calculated using Newton's second law of motion, which states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the force applied is 60 N and the mass of the object is 500 grams (or 0.5 kg). Therefore, the acceleration can be calculated as 60 N / 0.5 kg = 120 N/kg.

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• 19.

Seekor burung bermassa 0,8 kg bertengger pada dahan. Gaya yang dikerjakan dahan pada burung adalah . . . .

• A.

0 N

• B.

1,6 N

• C.

7,8 N

• D.

8,0 N

D. 8,0 N
Explanation
The correct answer is 8,0 N. The bird is at rest on the branch, which means that the net force acting on it is zero. According to Newton's second law of motion, the net force on an object is equal to the product of its mass and acceleration. Since the bird is not accelerating, the net force must be zero. Therefore, the force exerted by the branch on the bird must also be zero.

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• 20.

Sebuah buku dengan berat w diletakkan di atas meja. Besar gaya normal yang dikerjakan permukaan meja pada buku adalah . . . .

• A.

Sama dengan w

• B.

Lebih besar dari w

• C.

Lebih kecil dari w

• D.

Tidak dapat ditentukan jika hanya berat yang diketahui

A. Sama dengan w
Explanation
The correct answer is "sama dengan w" because the normal force exerted by a surface is equal in magnitude and opposite in direction to the weight of an object placed on it. Therefore, the normal force exerted by the table on the book is equal to the weight of the book, which is w.

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• 21.

Jika gaya yang bekerja pada sebuah benda digandakan menjadi dua kali, dan massa benda digandakan menjadi dua kali, maka percepatan yang dihasilkan . . . .

• A.

Tetap seperti semula

• B.

Dua kali semula

• C.

Tiga kali semula

• D.

Empat kali semula

A. Tetap seperti semula
Explanation
Jika gaya yang bekerja pada sebuah benda digandakan menjadi dua kali, dan massa benda digandakan menjadi dua kali, maka percepatan yang dihasilkan akan tetap seperti semula. Hal ini karena percepatan didefinisikan sebagai perubahan kecepatan per satuan waktu, dan kecepatan adalah hasil dari gaya yang bekerja pada benda dibagi dengan massa benda. Jadi, jika gaya dan massa benda digandakan dengan faktor yang sama, maka perbandingan gaya terhadap massa akan tetap sama, sehingga percepatan juga akan tetap sama.

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• 22.

Select the ones you like

• A.

Option1

• B.

Option2

• C.

Option3

• D.

Option4

A. Option1
Explanation
The explanation for the given correct answer, Option 1, is not available as the question does not provide any context or criteria for selecting the preferred option.

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• 23.

Select the ones you like

• A.

Option1

• B.

Option2

• C.

Option3

• D.

Option4

A. Option1
Explanation
The question asks the test-taker to select the options they like. Since the answer is "Option1," it implies that the test-taker likes Option1 the most out of all the given options.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Aug 24, 2016
Quiz Created by
Anjuprayudi