Contoh Soal : GLB dan GLBB | Gerak Lurus (1)

Introduction

In this tutorial, we will explore the concepts of Gerak Lurus Berubah (GLB) and Gerak Lurus Berubah Beraturan (GLBB), which translate to Uniform Linear Motion and Uniformly Accelerated Linear Motion, respectively. Understanding these two fundamental concepts in physics is essential for solving various motion-related problems. This guide will break down key principles and provide example problems to help you master GLB and GLBB.

Step 1: Understanding GLB

• Definition: GLB refers to motion at a constant speed in a straight line. The velocity remains unchanged over time.

• Key Formula:

  • The distance (s) traveled can be calculated using the formula:

    s = vt
    

    where:
    • s = distance
    • v = constant velocity
    • t = time

• Example:

  • If a car travels at a speed of 60 km/h for 2 hours, the distance traveled is:

    s = 60 km/h * 2 h = 120 km
    

Step 2: Understanding GLBB

• Definition: GLBB involves motion where the object accelerates uniformly. This means the velocity changes at a constant rate.

• Key Formulas:

  • The distance (s) traveled can be calculated using:

    s = vt + (1/2)at^2
    

    where:
    • a = acceleration
  • The final velocity (v) can be calculated using:

    v = u + at
    

    where:
    • u = initial velocity
    • t = time

• Example:

  • A train starts from rest (u = 0) and accelerates at a rate of 2 m/s² for 5 seconds:
    • Final velocity:

      v = 0 + (2 m/s² * 5 s) = 10 m/s
      

    • Distance traveled:

      s = 0 + (1/2 * 2 m/s² * (5 s)²) = 25 m
      

Step 3: Solving GLB and GLBB Problems

• Identify the Type of Motion: Determine whether the problem involves GLB or GLBB.
• List Known Values: Write down initial velocity, final velocity, acceleration, time, and distance values given in the problem.
• Choose the Right Formula: Based on the values you have, select the appropriate formula to use for calculations.
• Solve Step-by-Step: Carefully substitute known values into the formula and calculate the unknown.

Common Pitfalls to Avoid

• Confusing GLB with GLBB: Remember, GLB has constant velocity while GLBB has changing velocity.
• Misreading the problem: Ensure you understand what is being asked before choosing your formulas.
• Rushing calculations: Take your time to avoid simple arithmetic errors.

Conclusion

Understanding the principles of GLB and GLBB is crucial for solving physics problems related to motion. By following the steps outlined in this tutorial, you can confidently tackle various motion problems. Practice with different scenarios to solidify your understanding, and don't hesitate to revisit the formulas and examples provided. Happy studying!