Pengukuran | Jangka Sorong | IPA Kelas 7 SMP/MTs | EDURAYA MENGAJAR
Summary
TLDRThis instructional video demonstrates how to use a vernier caliper to measure the thickness, diameter, and depth of holes in objects with a precision of 0.01 mm. The video explains the parts of the caliper, including the fixed and movable jaws, and the main and vernier scales. It guides viewers through the process of measuring the thickness of a book, from adjusting the caliper jaws to reading the measurement by aligning the main scale with the vernier scale's precise line. The tutorial concludes by encouraging viewers to practice using the caliper themselves.
Takeaways
- 📏 The script is a tutorial on how to use a vernier caliper to measure the thickness of an object.
- 🛠 There are specialized tools for measuring thickness, such as a vernier caliper, which is different from a mistar.
- ✅ The vernier caliper can measure not only thickness but also the diameter of an object with a hole and the depth of the hole.
- 🔍 The precision of the vernier caliper is 0.01 mm, allowing for very detailed and accurate measurements.
- 🔧 The caliper consists of a fixed upper jaw and a fixed lower jaw, as well as a movable upper and lower jaw for adjusting the measurement range.
- 🔑 The caliper has a locking screw to secure the jaws in place once the measurement is taken.
- 📐 The caliper features two scales: a main scale and a vernier scale, which work together to read the measurement.
- 📚 The tutorial demonstrates measuring the thickness of a textbook using the vernier caliper.
- 🔄 To take a measurement, the user must turn the locking screw to open the jaws, place the object between the jaws, and then close the jaws again.
- 📏 Reading the measurement involves looking at the main scale for whole numbers and the vernier scale for the decimal portion, using a line that aligns with the vernier scale.
- 🎓 The example given results in a measurement of 2.28 cm, calculated by adding the whole number from the main scale to the decimal from the vernier scale.
Q & A
What is the purpose of the tool described in the script?
-The tool described in the script is used for measuring the thickness, diameter, and depth of holes in objects with a high degree of precision.
What is the accuracy level of the measuring tool mentioned?
-The measuring tool has an accuracy level of 0.01 mm, allowing for very precise measurements.
What are the different parts of the measuring tool discussed in the script?
-The different parts of the measuring tool include the fixed upper jaw, the fixed lower jaw, the movable upper jaw, the movable lower jaw, and the vernier scale.
How does one use the measuring tool to measure the thickness of an object?
-To measure the thickness of an object, one must rotate the lock knob to open the lower jaw, place the object between the jaws, adjust the movable jaws to fit the object, and then close the lock knob. The measurement is then read from the main scale and the vernier scale.
What is the function of the vernier scale on the measuring tool?
-The vernier scale on the measuring tool is used in conjunction with the main scale to provide more precise readings, allowing for measurements to be taken to the nearest 0.01 mm.
How does one read the measurement from the main scale and vernier scale?
-One reads the measurement by noting the position of the zero mark on the vernier scale relative to the main scale, and then counting the number of lines on the vernier scale that align with the main scale, each line representing 0.01 mm.
What is the significance of the 'toothed rack' mentioned in the script?
-The 'toothed rack' is likely a part of the vernier caliper mechanism that allows for the fine adjustment of the jaws to measure the object accurately.
How does the script demonstrate the measurement of a book's thickness?
-The script demonstrates the measurement of a book's thickness by placing the book between the jaws, adjusting the jaws to fit the book, and then reading the measurement from the scales.
What is the final measurement of the book's thickness given in the script?
-The final measurement of the book's thickness is 2.28 cm, as calculated by adding 0.08 cm (from the vernier scale) to 2.2 cm (from the main scale).
What is the importance of ensuring the vernier caliper is positioned straight when measuring?
-Ensuring the vernier caliper is positioned straight is important for accurate measurements, as any tilt can lead to incorrect readings.
What is the purpose of the 'locking screw' on the measuring tool?
-The 'locking screw' on the measuring tool is used to fix the position of the jaws once the object is placed between them, ensuring the measurement remains stable while the reading is taken.
Outlines
📏 Measuring Thickness with a Vernier Caliper
This paragraph introduces a tool for measuring the thickness of objects, specifically mentioning that a mistar is not used for this purpose. Instead, a vernier caliper is recommended. The vernier caliper is highlighted for its precision, with an accuracy of 0.01 mm, allowing for detailed and accurate measurements. The paragraph explains the parts of the caliper, including the fixed upper and lower jaws, and the movable jaws. It also mentions the use of a thimble at the end of the tool for measuring the depth of holes in objects. The importance of the scale on the caliper is emphasized, with two types of scales: the main scale and the vernier scale. The process of using the caliper to measure the thickness of a textbook is demonstrated, including opening the jaws, placing the object between the jaws, and reading the measurement from both the main scale and the vernier scale. The reading technique involves noting the position of the zero mark on the vernier scale and counting the lines between the main scale and the vernier scale. The example concludes with a calculation of the thickness of the textbook as 2.28 cm.
Mindmap
Keywords
💡Measurement
💡Caliper
💡Thickness
💡Diameter
💡Depth
💡Precision
💡Scale
💡Vernier Scale
💡Reading
💡Accuracy
💡Thickness Measurement
Highlights
Introduction to measuring the thickness of an object without using a mistar.
Use of a caliper to measure thickness, diameter, and depth of holes in objects.
The caliper's precision level is 0.01 mm, allowing for detailed and accurate measurements.
Explanation of the parts of the caliper, including fixed and movable jaws.
Demonstration of how to use the caliper to measure the thickness of a textbook.
Instructions on adjusting the caliper jaws to fit the object being measured.
Ensuring the caliper is positioned straight for accurate measurements.
How to read the main scale and vernier scale on the caliper.
Step-by-step guide on reading the measurement from the caliper's scales.
Calculating the measurement by combining the main scale and vernier scale readings.
Final measurement result of 2.28 cm after reading the caliper scales.
Encouragement for viewers to practice using the caliper themselves.
Conclusion of the tutorial with a sign-off until the next material.
Musical outro signaling the end of the tutorial.
Transcripts
Hai kalau kamu ingin mengukur ketebalan
suatu benda seperti ini apakah kamu juga
memakai mistar it's tentu tidak ya Ada
alat sendiri untuk mengukur ketebalan
suatu benda loh kamu bisa menggunakan
jangka sorong seperti ini nih selain
bisa mengukur ketebalan jangka sorong
juga bisa mengukur diameter suatu benda
jika benda tersebut berlubang kemudian
jangka sorong bisa digunakan untuk
mengukur kedalaman lubang suatu benda
loh menariknya alat ini memiliki tingkat
ketelitian 0,01 mm Wah kamu bisa
mengukur ukuran suatu benda dengan lebih
teliti dan akurat Oke ini adalah
bagian-bagian dari jangka sorong ya Nah
ada rahang tetap atas dan ada rahang
tetap bawah kamu
bisa menggeser rahang tetap ini ya
kemudian ada rahang Sorong atas dan
rahang Sorong bawah rahang Sorong inilah
yang bisa kamu geser kalau ini tombol
kunci dan itu di ujung alat ini ada
tangkai itu untuk mengukur kedalaman
suatu benda nah kemudian yang harus kamu
perhatikan itu skalanya skalanya ada dua
ya yang atas itu skala utama dan yang
bawah itu Skala nonius atau vernier
lewat skala ini kamu bisa membaca hasil
pengukurannya aku akan memakai jangka
sorong ini untuk mengukur ketebalan buku
pelajaranku caranya putar tombol kunci
untuk membuka rahang bawah kemudian
Letakkan buku pelajaran di antara rahang
ini geser rahang jangka sorong agar
rahang tepat pada buku lalu putar lagi
tombol kuncinya
Hai dan pastikan posisi jangka sorong
benar-benar lurus Setelah itu kita bisa
lihat kalanya untuk melihat kalanya yang
paling atas itu skala utama dan bagian
bawah itu skala nonius lalu cara
membacanya kamu perhatikan Skala yang
bagian atas dari angka 2 sampai 3 ya Nah
setiap Skala yang kecil-kecil ini
nilainya 0,1 Jadi dua koma 12 koma 22
koma 3 dan seterusnya kemudian
Perhatikan angka nol yang ada di skala
nonius ini perhatikan posisinya ya Angka
nol ini terletak diantara 2,2 dan 2,3
nah yang digunakan yang bagian depan
yaitu 2,2 Setelah itu kita baca skala
nonius caranya dengan mencari
nah atau garis yang berimpit coba
perhatikan garis yang atas sini berimpit
dengan garis yang bawah jadi inilah yang
digunakan sebagai acuan kemudian hitung
garis tersebut 12345678 Oke jadi bisa
dituliskan delapan kali 0,01 hasilnya
2,2 ditambah 0,08 hasilnya sama dengan
dua koma 28 cm Oke sekarang kamu bisa
mencoba membaca jangka sorong sendiri ya
Sekian dulu materi kali ini sampai jumpa
di materi lainnya
[Musik]
hai hai
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