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Acne problem. Physics.

6/21 Edited to

... Read moreถ้าคีย์เวิร์ดที่เจอบ่อยคือ “สูตร แรง” ส่วนตัวมองว่าอย่าท่องสูตรแบบแยกๆ แต่ให้จำเป็น “ชุดเครื่องมือ” ที่พาเราไปตั้งสมการได้ทันที โดยเฉพาะเวลาเจอโจทย์ สอวน. เรื่องการเคลื่อนที่ในแนวตรง/แนวดิ่ง (แบบปล่อยวัตถุ/ปาวัตถุลง หรือโยนขึ้นแล้วชนกัน) สูตรแรงที่ใช้จริงจะวนอยู่ไม่กี่ตัวครับ 1) สูตรแรงพื้นฐานที่ควรรู้ (ใช้ตั้งโจทย์ได้เกือบทุกข้อ) - กฎข้อที่ 2 ของนิวตัน: \(\sum F = ma\) จำให้ขึ้นใจว่า “ผลรวมแรงตามทิศที่เลือก” เท่ากับมวลคูณความเร่ง - น้ำหนัก (แรงโน้มถ่วง): \(W = mg\) ทิศลงเสมอ (ใกล้ผิวโลก) - แรงปกติ: \(N\) ตั้งฉากผิวสัมผัส (ไม่ได้เท่ากับ mg เสมอ ต้องดูมีแรงอื่น/มีความเร่งในแนวตั้งไหม) - แรงเสียดทาน: \(f = \mu N\) (กรณีเสียดทานจลน์) ทิศต้านการเคลื่อนที่หรือแนวโน้มการเคลื่อนที่ - แรงตึงเชือก: \(T\) ตามแนวเชือก (สำคัญคือตั้งทิศให้ชัด) 2) เทคนิค “เลือกแกน” ให้เข้ากับโจทย์แนวดิ่ง โจทย์แนวตรง/แนวดิ่งในสอวน. มักทำให้พลาดเรื่องเครื่องหมาย +/− มากที่สุด วิธีที่ผมใช้คือ - เลือกแกน + ขึ้น หรือ + ลง ไปเลยทั้งข้อ - เขียนแรงทุกแรงพร้อมเครื่องหมายตามแกน ตัวอย่าง: วัตถุเคลื่อนที่แนวดิ่งแบบไม่คิดแรงต้านอากาศ จะเหลือแรงเดียวคือ \(mg\) ถ้าเลือกแกน + ขึ้น ⇒ \(\sum F = -mg = ma\) ⇒ \(a = -g\) ถ้าเลือกแกน + ลง ⇒ \(\sum F = +mg = ma\) ⇒ \(a = +g\) ผลฟิสิกส์เหมือนกัน แค่สัญลักษณ์ต่างกัน 3) เชื่อม “สูตรแรง” กับ “สูตรการเคลื่อนที่” ในโจทย์โยน/ปล่อย เมื่อได้ความเร่งจาก \(\sum F = ma\) แล้ว ค่อยไปใช้สมการการเคลื่อนที่ (SUVAT) เช่น - \(v = u + at\) - \(s = ut + \tfrac{1}{2}at^2\) - \(v^2 = u^2 + 2as\) ในโจทย์รูปแบบ “ปล่อย A จากที่สูง แล้วปา B ตามลงมา” หรือ “โยน A และ B ขึ้นแนวดิ่งแล้วชนกัน” สิ่งที่ทำให้เร็วคือ - ตั้งสมการตำแหน่งของแต่ละวัตถุเป็นฟังก์ชันเวลาเดียวกัน (ใช้ t เดียว) - ให้จุดชนกัน/จุดเจอกันเป็นเงื่อนไข: \(s_A(t)=s_B(t)\) หรือ \(y_A(t)=y_B(t)\) จากนั้นค่อยแก้หา t แล้วกลับไปหา v หรือความสูง 4) เช็กลิสต์กันพลาด (ใช้ได้จริงตอนทำโจทย์สอวน.) - ก่อนแทนค่า ให้เขียน FBD (แผนภาพแรง) สั้นๆ ทุกครั้ง - ตรวจหน่วย: แรงเป็นนิวตัน (N) = kg·m/s² - ถ้าโจทย์ “โยนขึ้น” ความเร่งยังเป็น \(-g\) (ถ้าเลือกแกนขึ้นเป็นบวก) ไม่ได้เปลี่ยนตามทิศความเร็ว - คำว่า “ปล่อย” แปลว่า \(u=0\) ณ ตอนเริ่ม ถ้าจะซ้อมให้ชัวร์ แนะนำลองทำโจทย์แนวดิ่ง 2 แบบนี้: (1) ปล่อย/ปาลงจากที่สูง แล้วถามอัตราเร็วตอนทันกัน (2) โยนขึ้นสองวัตถุคนละเวลา/คนละความเร็ว แล้วถามความสูงที่ชนกัน พอจับหลัก \(\sum F=ma\) + ตั้งสมการตำแหน่งร่วมกันได้ คำว่า “สูตร แรง” จะไม่ใช่เรื่องท่องจำ แต่เป็นเครื่องมือแก้โจทย์ครับ

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Reminder: What’s a trigger for me, may NOT be a trigger for you! Everything is trial and error when finding your acne triggers. Also, I am not a doctor and this is not medical advice! Please do your own research 💗 My Acne Triggers: • Eggs 🥚 • Nuts 🥜 • Raisins 🍇 I also have a list of sup
Kalieens

Kalieens

611 likes

Your Acne Map
What’s your health prob? Acne map for you to figure it out #acnemap #acne #acnetreatment #acneproneskin #acnejourney
Gina’s Glow Lab

Gina’s Glow Lab

14 likes

Acne Prone - Skin Progress
Skin updates so far!!! Haven't gotten a facial done in over a year now- just less stress, more patience and a good skincare routine 💕 #skinupdate #acnescars #acneproneskin #skincare
Anyely Marie🌹

Anyely Marie🌹

789 likes

#lemon8diarychallenge
Lemon105626851316

Lemon105626851316

121 likes

A laptop screen displays a brown overlay with the title "Physics Youtubers for a 4.0 F=ma" and physics-related icons, suggesting a guide to YouTube channels for physics students.
A blurred laptop screen shows the YouTube channel "Self-Taught Physicist" with videos on classical mechanics and math proofs, highlighted by the text "Excellent tips and resources for beginners."
A blurred laptop screen displays the YouTube channel "Dermot O'Reilly" featuring videos on natural philosophy and geometry, accompanied by the text "Great lectures and book recommendations."
These YouTubers Will Help You ACE Physics!
These YouTubers are so great because they are amazing at helping you learn everything that you need to ACE your physics classes! The Channels: Self-Taught Physicist Dermot O'Reilly Susskind Lectures Quanta Magazine COMMENT if you have watched any of these YouTubers videos and if you a
CompSkyy

CompSkyy

285 likes

ACTUALLY WORKS
this is my holy grail🙏 #products for acne #acneproducts #skincare #acneproductsthatwork #acneproneskin
madisonleigh

madisonleigh

2053 likes

I know some people are going to call this extreme but this is the way I live lol #acne #acneproneskin
Shaielexis

Shaielexis

604 likes

Why acne happens to us
Here are just 3 MAJOR 🔑 keys to why acne may appear for some. 1. Stress. Sometimes it is hard to have a balance with what’s going on in our lives however, there is a hormone named cortisol that arises when we are stressed whether mentally, emotionally, and/or physically. Cortisol tells your body
Carina The Aesthetican

Carina The Aesthetican

238 likes

Physics tips from a physics PhD student
Here are my best tips for physics!! I hear people say all the time how physics is impossible but I think a lot of that is not studying properly. Focusing on examples is key. Of course do the examples done in class of homework’s but then finding similar problems to practice with is key!! Be
Sarah :)

Sarah :)

44 likes

The Hormonal Acne Beauty Routine that saved me!
It’s hard to have PCOS! You gain weight and not only that, you can have hormonal acne that is very difficult to treat. This simple beauty routine is what saved me. 1. Apply DIFFERIN at night and a moisturizer. I use La Roche Posay Baume B5. 2. Moisturize and moisturize. It will help you with
Nina

Nina

477 likes

Let’s rebuild your confidence by getting rid acne
#acnefighter #acnetreatment #glowup #fyp #skincare
Elise ✨

Elise ✨

98 likes

Tips 4 you
TikTok creator #savetiktok #blowthisuptiktok
(っ◔◡◔)っ 🍓🫶Armando🫶🍓

(っ◔◡◔)っ 🍓🫶Armando🫶🍓

1217 likes

A woman in a car with a search bar overlay asking "why stress is bad for your skin," looking directly at the camera with a serious expression.
A woman lying in bed with text overlay explaining how increased cortisol production from stress stimulates oil glands and increases inflammation, worsening skin conditions.
A woman taking a mirror selfie in a bathroom, with text overlay detailing how chronic stress weakens the immune system and causes inflammatory, painful breakouts.
this could be causing your breakouts…
NOTHING breaks me out like being stressed 🤠 chronic stress causes a domino effect throughout your body, and the inflammation alone is enough to disrupt my skin for weeks. of course acne can be caused by SO much more than just stress, but stress breakouts are really the only kind of acne i exper
carley ◡̈

carley ◡̈

81 likes

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