GLB DAN GLBB | Gerak Lurus #2 - Fisika Kelas 10

Introduction

This tutorial will guide you through the concepts of Gerak Lurus Beraturan (GLB) and Gerak Lurus Berubah Beraturan (GLBB), fundamental topics in physics for 10th-grade students. Understanding these concepts is crucial for analyzing motion and applying physics principles to real-world scenarios.

Step 1: Understanding GLB

Gerak Lurus Beraturan (GLB) refers to motion with a constant speed in a straight line. Here’s how to understand and identify it:

• Key Characteristics:

  • Constant velocity (both speed and direction remain unchanged).
  • The distance covered is directly proportional to time.

• Graphical Representation:

  • Distance-time graph is a straight line.
  • Slope of the line indicates speed.

• Practical Example:

  • A car moving at a steady speed of 60 km/h on a straight road represents GLB.

Step 2: Understanding GLBB

Gerak Lurus Berubah Beraturan (GLBB) involves motion with a constant acceleration. This is how to break it down:

• Key Characteristics:

  • Velocity changes at a constant rate.
  • The distance covered is proportional to the square of time.

• Equations of Motion:

  • Use the following equations for calculations:
    • ( v = u + at ) (final velocity)
    • ( s = ut + \frac{1}{2}at^2 ) (displacement)
    • ( v^2 = u^2 + 2as ) (relationship between velocity and displacement)

• Practical Example:

  • A car accelerating from rest to 100 km/h in 10 seconds demonstrates GLBB.

Step 3: Applying GLB and GLBB in Problem Solving

To effectively solve problems involving GLB and GLBB, follow these steps:

• Identify the Motion Type:

  • Determine if the problem involves constant speed (GLB) or constant acceleration (GLBB).

• Choose the Right Equation:

  • For GLB, use distance = speed × time.
  • For GLBB, select the appropriate equation based on known variables.

• Example Problem:

  • A bus travels 150 km at a constant speed of 75 km/h. How long does it take?
    • Solution: Time = Distance / Speed = 150 km / 75 km/h = 2 hours.

Step 4: Common Pitfalls to Avoid

When studying GLB and GLBB, keep the following in mind:

• Confusing Speed with Velocity:

  • Speed is scalar (only magnitude), while velocity is vector (magnitude and direction).

• Misapplying Equations:

  • Ensure you are using the correct formula for the type of motion.

• Ignoring Units:

  • Always check that units are consistent across calculations (e.g., km/h to m/s).

Conclusion

In summary, understanding GLB and GLBB is vital for analyzing motion in physics. Remember to identify the type of motion, apply the correct equations, and keep common pitfalls in mind. As you practice these concepts, you'll develop a stronger grasp of motion and prepare well for future physics challenges. Next, consider exploring real-world applications of these concepts, such as analyzing the motion of vehicles or objects in sports.