Gerak Lurus • Part 1: Gerak Lurus Beraturan (GLB) dan Gerak Lurus Berubah Beraturan (GLBB)

Introduction

In this tutorial, we will explore the concepts of linear motion, specifically focusing on uniform linear motion (GLB) and uniformly accelerated linear motion (GLBB). Understanding these principles is essential in kinematics, a branch of physics that studies motion without considering the forces causing it. By the end of this guide, you will have a solid grasp of key terms, differences between GLB and GLBB, and practical examples to enhance your learning.

Step 1: Understand Key Terms in Linear Motion

Familiarize yourself with essential concepts related to linear motion:

• Jarak: Distance traveled by an object.
• Perpindahan: Displacement, which considers the shortest path from the initial to the final position.
• Kelajuan: Speed, defined as the distance per unit of time, regardless of direction.
• Kecepatan: Velocity, which includes both speed and direction.
• Perlajuan: Acceleration, the rate of change of velocity.
• Percepatan: Can also refer to acceleration, typically used interchangeably.

Practical Tip

When studying these terms, consider creating a comparison table to visualize the differences between distance and displacement, as well as speed and velocity.

Step 2: Explore Types of Linear Motion

Learn about the two main types of linear motion:

Uniform Linear Motion (GLB)

• Definition: Motion at a constant speed in a straight line.
• Key Characteristics:
  • No change in speed or direction.
  • Distance and displacement are equal over time.

Uniformly Accelerated Linear Motion (GLBB)

• Definition: Motion where the velocity changes at a constant rate.
• Key Characteristics:
  • Speed increases or decreases uniformly.
  • Distances covered in equal time intervals differ.

Common Pitfall

Many students confuse GLB with GLBB. Remember that in GLB, velocity remains constant, while in GLBB, it changes.

Step 3: Analyze Motion Graphs

Understand the graphical representation of GLB and GLBB:

• Velocity-Time Graph (v-t):

  • For GLB, the graph is a straight horizontal line, indicating constant velocity.
  • For GLBB, the graph is a straight inclined line, showing the increase or decrease in velocity.

• Displacement-Time Graph (s-t):

  • For GLB, the graph is a straight diagonal line.
  • For GLBB, the graph is a curve, indicating changing displacement over time.

Practical Tip

Draw sample graphs for both GLB and GLBB to familiarize yourself with their shapes and characteristics.

Step 4: Solve Example Problems

Practice by solving example problems related to GLB and GLBB:

1. Example Problem: Determine the distance traveled, displacement, average speed, and average velocity of an object in GLB.

   • Given: Initial position, final position, and time.
   • Calculate:
     • Distance = final position - initial position
     • Displacement = straight-line distance from start to end
     • Average speed = total distance/time
     • Average velocity = displacement/time

2. Example Problem: Analyze an object under GLBB.

   • Given: Initial velocity, final velocity, time, and acceleration.
   • Calculate:
     • Use the formula ( s = ut + \frac{1}{2}at^2 ) where:
       • ( s ) is displacement
       • ( u ) is initial velocity
       • ( a ) is acceleration
       • ( t ) is time

Practical Tip

Work through several problems to reinforce your understanding and application of these formulas.

Conclusion

In this tutorial, we covered key concepts of linear motion, distinguishing between uniform linear motion (GLB) and uniformly accelerated linear motion (GLBB). Understanding these principles, along with their graphical representations and practical applications, is crucial for mastering kinematics. As a next step, consider practicing more problems and exploring further parts of the series for deeper insights into various motion types.