FISIKA KELAS X: GERAK LURUS (PART 2) Materi dan Contoh Soal GLB dan GLBB

Summary

This video explains key concepts of linear motion in physics, focusing on Uniform Rectilinear Motion (GLB) and Uniformly Accelerated Rectilinear Motion (GLBB). The presenter, Yusuf Ahmad, discusses the definitions, equations, and graphical representations for both types of motion. GLB is characterized by constant velocity and no acceleration, while GLBB involves a constant acceleration, either speeding up or slowing down. The video also includes example problems and solutions, illustrating how to calculate acceleration, distance, and time. The tutorial is aimed at 10th-grade students, making complex concepts easy to understand through clear explanations and visuals.

Takeaways

• 😀 GLB (Uniform Rectilinear Motion) involves motion with constant velocity and no acceleration.
• 😀 The formula for GLB is S = V * T, where S is distance, V is velocity, and T is time.
• 😀 In GLB, the displacement vs. time graph is a straight line, and velocity vs. time is a horizontal line.
• 😀 GLB has no acceleration, so the acceleration vs. time graph is a horizontal line at zero.
• 😀 GLBB (Uniformly Accelerated Rectilinear Motion) involves motion with constant acceleration.
• 😀 GLBB equations include: V_T = V_0 + a * t, V_T^2 = V_0^2 + 2 * a * S, and S = V_0 * t + 1/2 * a * t^2.
• 😀 In GLBB, the displacement vs. time graph is a parabola, and the velocity vs. time graph is a straight line with a slope representing acceleration.
• 😀 In GLBB, the acceleration vs. time graph is a horizontal line at a constant value.
• 😀 To solve problems involving GLBB, we can use equations based on initial velocity, acceleration, and time to find final velocity and displacement.
• 😀 An example problem shows a car with initial velocity of 72 km/h (converted to 20 m/s) stopping after 8 meters, where deceleration is calculated.
• 😀 Another example illustrates calculating distance and time for two cars moving towards each other with constant speeds, using their relative speeds to find when they meet.

Q & A

What is the definition of GLB (Gerak Lurus Beraturan)?

GLB, or Gerak Lurus Beraturan, refers to motion in a straight line with a constant speed, meaning the velocity does not change, and the acceleration is zero.

What is the equation for GLB (Gerak Lurus Beraturan)?

The equation for GLB is S = V * T, where S is the displacement, V is the constant speed, and T is the time.

What does the graph of displacement versus time look like for GLB?

The graph of displacement versus time for GLB is a straight line, showing that displacement increases linearly with time.

How does the graph of velocity versus time look for GLB?

For GLB, the velocity versus time graph is a horizontal line because velocity remains constant.

What does the graph of acceleration versus time look like for GLB?

The graph of acceleration versus time for GLB is a flat line at zero, since the acceleration is always zero.

What is GLBB (Gerak Lurus Berubah Beraturan)?

GLBB, or Gerak Lurus Berubah Beraturan, refers to motion in a straight line where the speed changes at a constant rate, meaning the acceleration is constant.

What are the key formulas for GLBB?

The key formulas for GLBB are: V = V₀ ± at, V² = V₀² ± 2as, and S = V₀t ± (1/2)at², where V₀ is the initial velocity, a is acceleration, t is time, and S is displacement.

When do we use the plus sign in GLBB formulas, and when do we use the minus sign?

The plus sign is used when the motion is accelerated (increasing velocity), and the minus sign is used when the motion is decelerated (decreasing velocity).

How does the displacement versus time graph look for accelerated GLBB?

For accelerated GLBB, the displacement versus time graph is a curve that opens upwards, showing increasing displacement with time.

What is the characteristic of the velocity versus time graph for decelerating GLBB?

For decelerating GLBB, the velocity versus time graph is a straight line sloping downwards, indicating a decrease in velocity over time.

How can we calculate the deceleration of a car that slows down to a stop in a certain distance?

To calculate deceleration, we use the formula V² = V₀² - 2as. If the car's initial velocity is 20 m/s and it stops after traveling 8 meters, we can solve for 'a' (deceleration).

How is the distance traveled during GLBB determined from a graph?

The distance traveled can be determined by calculating the area under the velocity versus time graph, representing the displacement during the motion.

What is the time taken for two cars moving towards each other to meet if they have constant speeds?

To find the time taken for two cars moving towards each other to meet, we can use the formula Time = Distance / Relative Speed, where relative speed is the sum of the speeds of both cars.