MATERI KINEMATIK kelas 11 bag 4 GERAK LURUS BERATURAN GLB K Merdeka
Summary
TLDRThis lesson explains the concepts of straight motion, focusing on two types: uniform linear motion (GLB) and uniformly accelerated motion (GLBB). It differentiates between horizontal (x-axis) and vertical (y-axis) motion, using examples such as walking and throwing an object. The lesson introduces key formulas for calculating distance, speed, and time, emphasizing the importance of units and conversions. Through practical examples, students learn how to solve motion problems and understand how graphs represent uniform motion. A practice section encourages learners to apply these concepts for deeper understanding.
Takeaways
- 📏 Linear motion refers to the movement of an object along a straight path.
- 🚗 There are two types of linear motion: Uniform Linear Motion (GLB) and Uniformly Accelerated Linear Motion (GLBB).
- ⬅️ GLB refers to motion where the speed is constant, and the acceleration is zero.
- 🎯 In GLB, the velocity remains the same over time, and the acceleration is zero since there is no change in speed.
- 📊 The graph of velocity (V) versus time (T) in GLB is a straight line, showing constant speed.
- 📐 The equation for GLB is X = V * T, where X is distance, V is velocity, and T is time.
- 📏 GLBB, on the other hand, involves changing velocity, which can be horizontal (x-axis) or vertical (y-axis).
- 🕒 In GLBB, velocity can either increase or decrease over time, resulting in a curved graph for position (X) vs time (T).
- ✏️ Practical examples in the video include solving for distance and speed, using the formula X = V * T and converting units from km/h to m/s.
- 💡 The lesson encourages students to practice solving problems related to uniform motion by changing units and applying the correct formulas.
Q & A
What is the definition of linear motion (gerak lurus)?
-Linear motion is the movement of an object along a straight path. It means the object's trajectory is a straight line.
What are the two types of linear motion?
-The two types of linear motion are Uniform Linear Motion (Gerak Lurus Beraturan - GLB) and Accelerated Linear Motion (Gerak Lurus Berubah Beraturan - GLBB).
What is uniform linear motion (GLB) and its characteristics?
-Uniform linear motion (GLB) occurs when an object moves with a constant speed. The key characteristics of GLB are constant velocity and zero acceleration.
What is accelerated linear motion (GLBB), and what are its types?
-Accelerated linear motion (GLBB) involves a change in velocity over time, meaning the object is either speeding up or slowing down. There are two types: horizontal GLBB (movement along the x-axis) and vertical GLBB (movement along the y-axis).
How does the velocity-time (v-t) graph look in GLB?
-In uniform linear motion (GLB), the velocity-time graph is a straight, horizontal line because the velocity remains constant.
How does the position-time (x-t) graph behave in GLB?
-The position-time (x-t) graph in GLB has a straight slanted line, showing that the object covers equal distances over equal intervals of time.
What is the formula for distance in uniform linear motion?
-The formula for distance (x) in uniform linear motion is x = v * t, where 'v' is velocity and 't' is the time taken.
How do you convert velocity from km/h to m/s?
-To convert velocity from km/h to m/s, multiply the value by 1000 to convert kilometers to meters, then divide by 3600 to convert hours to seconds. For example, 54 km/h is equal to 15 m/s.
What is the acceleration in uniform linear motion (GLB)?
-The acceleration in uniform linear motion (GLB) is zero because the velocity is constant and does not change over time.
How would you calculate distance if a car is moving at 15 m/s for 300 seconds?
-Using the formula x = v * t, where v = 15 m/s and t = 300 seconds, the distance traveled is 4500 meters.
Outlines
📏 Introduction to Linear Motion
The speaker begins by explaining the concept of linear motion, where the movement of an object follows a straight path. Two types of linear motion are introduced: uniform linear motion (Gerak Lurus Beraturan, GLB) and uniformly accelerated linear motion (Gerak Lurus Berubah Beraturan, GLBB). GLBB is further divided into horizontal (along the x-axis) and vertical (along the y-axis) motion. An example of horizontal motion is walking, while vertical motion involves throwing objects up or down. The focus is then shifted to GLB, where speed remains constant, and acceleration is zero. Various characteristics of GLB are explained, such as the consistent velocity and how the v-t and x-t graphs behave.
📝 Calculating Distance in Uniform Motion
This paragraph delves into the formula used to calculate distance in uniform motion: X = V * T or V = X/T, where X is distance, V is velocity, and T is time. The speaker reminds the audience of the simplified form of this formula from elementary school (JKW = jarak, kecepatan, waktu), but emphasizes the proper use of symbols in high school physics. The example provided involves converting units, such as velocity from km/h to m/s and time from minutes to seconds, then applying the formula to find the distance traveled. The example shows how a car moving at 15 m/s for 300 seconds covers 4500 meters.
🤔 Problem-Solving Example: Speed and Time
The speaker introduces a problem-solving exercise for the students, focusing on calculating speed when given distance and time. In this exercise, time is given in minutes, and the students must convert it to seconds before solving the problem. The speaker encourages students to recall how to convert units from earlier lessons and apply these techniques to find the solution. The paragraph ends by prompting students to continue learning through the next instructional video.
Mindmap
Keywords
💡Gerak Lurus
💡Gerak Lurus Beraturan (GLB)
💡Gerak Lurus Berubah Beraturan (GLBB)
💡Kecepatan (Velocity)
💡Percepatan (Acceleration)
💡Horizontal dan Vertikal
💡Sumbu X dan Sumbu Y
💡Grafik V terhadap T (Velocity-Time Graph)
💡Rumus GLB
💡Unit Conversion
Highlights
Introduction to straight-line motion (gerak lurus)
Definition of straight-line motion as a movement along a straight path
Explanation of two types of straight-line motion: uniform (GLB) and non-uniform (GLBB)
GLBB motion can be horizontal or vertical
Horizontal motion is discussed along the x-axis
Vertical motion is discussed along the y-axis
Example of horizontal motion: walking
Example of vertical motion: throwing an object up or an object falling down
Discussion on uniform straight-line motion (GLB)
Illustration of GLB with constant speed from 0 to 10, 20 to 30
Characteristics of GLB: constant speed and zero acceleration
Explanation of how to calculate acceleration: final speed minus initial speed over time
Description of the timer results for GLB: equal-sized points indicating constant distance
Graph of velocity (V) versus time (t) for GLB is a straight line
Formula for GLB: S = V * T or V = s/t
Explanation of the symbols used: X for distance, V for velocity, and t for time
Mnemonic for remembering the formula: JKW (jarak = kecepatan dikali dengan waktu)
Example problem 1: A car moving at a constant speed of 54 km/h
Conversion of speed units from km/h to m/s
Calculation of distance traveled in a given time
Example problem 2: An object moving with uniform straight-line motion (GLB)
Explanation that the speed in GLB is constant and acceleration is zero
Encouragement for students to practice with the provided exercises
Invitation to continue with the next learning video
Transcripts
Nah sekarang kita lanjutkan bagian yang
c yaitu gerak lurus nah gerak lurus itu
adalah maksudnya gerak lurus adalah
Gerak suatu benda yang lintasannya
berupa garis lurus berarti ini dia
lintasannya lurus ya kemudian gerak
lurus itu nanti kita pelajari ada dua
jenis yang pertama gerak lurus beraturan
yaitu kepanjangannya kependekannya GLB
Ya gerak lurus beraturan dan gerak lurus
berubah beraturan yaitu GLBB nah GLBB
ini juga ada dua nanti yaitu horizontal
dan vertikal horizontal itu kita
bahasnya adalah di sumbu x ya vertikal
itu adalah di sumbu y Jadi kalau di
sumbu x ini Contohnya kayak kita
berjalan gitu ya kalau vertikal itu
Contohnya kayak kita melempar benda ke
atas atau benda jatuh ke bawah oke nah
pertama kita bahas dulu gerak lurus
beraturan GLB ya Nah jadi di sini
contohnya ilustrasi dari GL itu ini
misalnya dari 0 sampai ke-10 jaraknya ya
dari 10 20 20 ke 30 itu dia kecepatannya
tetap ya nah nih lihat nih ini 10 10
jadi artinya di sini
kecepatannya tetap dan percepatannya 0
karena kecepatannya tetap berarti kan
kalau kita kurangkan awal dengan akhir
kan 0 jadinya percepatannya 0 sedangkan
v-nya tetap itu ciri-ciri GLB ya
Kemudian yang kedua kalau hasil dari
tikar timernya itu titik-titiknya adalah
sama sama besar ya jaraknya kemudian
yang ketiga kalau grafik V terhadap t
dia akan lurus saja Jadi kenapa lurus
karena dia itu v-nya tidak berubah
meskipun kayaknya berubah misalnya di
sini C1 ini T2 jadi berapapun waktunya
dari satu detik dua detik tiga detik
tetap v nya segitu aja kan tetap 10
Nggak berubah ya Nah kemudian sedangkan
grafik grafik X terhadap TX itu kan
jarak ya kita tahu jarak itu dan t jadi
dia mengalami apa
miringnya ada kemiringan nah sehingga
nanti bisa kita cari rumus dari GLB itu
adalah S = V * T atau V = s/t dimana Oh
ya Ini seharusnya bukan es ya Ini
seharusnya x oke
ini x ini x Nah jadi karena kita pakai
lambangnya X ya jadi X = V * T atau V =
x/t di mana X itu adalah jarak V itu
adalah kelajuan dan t itu adalah selang
waktu Oke kalau di SD kita belajar cara
mengingatnya itu kan JKW ya JKW jarak =
kecepatan dikali dengan waktu kalau
sekarang karena kita udah belajar di
fisika SMA itu berarti kita harus paham
lambang-lambang dari jarak itu adalah x
kemudian kecepatan itu adalah V dan t
itu adalah waktu oke
Nah di sini kita lihat contohnya ya
soal nomor 1 kita lihat contohnya Sebuah
mobil bergerak lurus dengan kelajuan
berarti diketahui itu adalah
V ya V = 54
km/jam nah ini bagusnya kita rubah ya
kan kita udah pernah belajar kelas 1
dulu cara merubah satuan berarti kalau
kita rubah ke meter per sekon jadinya
ini adalah
54.000 ya per 300 3600
54 / 36 itu bisa nggak ya
bagi 9 itu 60 bagi 9 itu 4 berarti ini
jadinya 15 ya 15 meter per sekon v nya
kemudian jarak yang ditempuh berarti t t
= 5 menit ini dirubah juga ke detik
berarti 5 * 60 detik ya sama dengan
300 Detik nah yang ditanya adalah jarak
berarti jarak itu X tadi kan Nah X itu
rumusnya adalah
V * T berarti 15 * 300 berarti adalah
4500 meter ya Sehingga jawabannya adalah
yang e Oke Paham ya adik-adik Nomor 2
Jika sebuah benda bergerak lurus
beraturan berarti artinya ini adalah GL
GLB kecepatannya berarti gimana
kecepatannya tadi Berarti kecepatannya
itu tetap dan percepatannya adalah nol
ya Sehingga jawabannya adalah yang c
Nah untuk lebih pahamnya adik-adik boleh
mengerjakan soal latihan berikut ini
soal nomor 1 nah ini nanti dirubah ya
Jadi yang diketahui adalah jarak
kemudian waktunya setengah menit nah
setengah menit itu berapa Detik Nah
nanti silakan dicari sendiri ya yang
ditanya adalah kecepatan nah kecepatan
itu nanti adik-adik harus merubah ke
dalam kilometer per jam Nah jadi
inget-ingat lagi pelajaran waktu kelas 1
ya
Nah untuk lebih pahamnya silahkan kita
lanjutkan video pembelajaran berikut ini
silahkan di klik ya
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