BAB V Gerak Parabola

Summary

In this educational video, the instructor explores the concepts of motion in physics, specifically focusing on uniform rectilinear motion (GLB) and uniformly accelerated motion (GLBB). Through relatable examples such as a moving car and a thrown apple, the instructor introduces parabolic motion, illustrating how objects move along curved paths. The video highlights the importance of velocity components in both horizontal and vertical axes, culminating in a practical problem-solving session involving a basketball throw. The session concludes with real-life applications of parabolic motion, encouraging viewers to recognize these principles in everyday activities.

Takeaways

• 😀 The movement of a car at a constant speed on a horizontal plane represents uniform linear motion (GLB).
• 😀 An apple thrown upward and then falling downwards exhibits uniformly accelerated motion (GLBB) due to gravitational influence.
• 😀 The trajectory of a basketball shot forms a parabolic path due to the combination of horizontal and vertical motions.
• 😀 The initial velocity of a basketball shot can be decomposed into horizontal (v0x) and vertical (v0y) components based on the launch angle.
• 😀 The velocity in the horizontal direction remains constant because there is no acceleration acting on it.
• 😀 In the vertical direction, the velocity changes due to gravitational acceleration, which decreases the upward speed and increases the downward speed.
• 😀 The shape of the basketball's trajectory is determined by the initial speed and the angle of projection.
• 😀 The position of the projectile can be calculated using equations of motion for both horizontal and vertical movements.
• 😀 An example problem illustrated the calculation of horizontal distance and height reached by a basketball thrown at a specific angle and speed.
• 😀 Real-life examples of parabolic motion include sports actions like basketball shooting, soccer ball kicking, and artillery firing.

Q & A

What is the definition of uniform motion as explained in the lesson?

Uniform motion refers to movement at a constant speed in a straight line, as exemplified by a car moving at a constant speed along a horizontal path.

What is the difference between the motion of the apple thrown vertically and the car moving horizontally?

The apple's motion is an example of uniformly accelerated motion due to gravity, while the car's motion is uniform linear motion with constant speed.

What is parabolic motion?

Parabolic motion is the trajectory followed by an object when it is thrown or propelled, forming a parabolic path due to the influence of gravity and initial velocity.

How is the initial velocity of the basketball decomposed in the lesson?

The initial velocity is decomposed into two components: horizontal (v0x) and vertical (v0y), using trigonometric functions based on the angle of projection.

What role does gravity play in the motion of the basketball?

Gravity affects the vertical motion of the basketball by providing a downward acceleration, which causes the ball to slow down while ascending and speed up while descending.

What are the equations of motion used to analyze the basketball's trajectory?

The horizontal motion uses the equation x = v0x * t, while the vertical motion uses y = v0y * t - (1/2)gt^2.

How can the height of the basketball at a specific time be calculated?

The height can be calculated using the vertical motion equation, substituting the values of initial vertical velocity, time, and gravitational acceleration.

What happens to the velocity of the basketball at the peak of its trajectory?

At the peak, the vertical component of the velocity becomes zero before the ball starts to descend.

Why is the motion of the basketball described as a combination of two types of motion?

The basketball's motion is a combination of uniform linear motion (horizontal) and uniformly accelerated motion (vertical), resulting in a parabolic trajectory.

Can you give examples of real-life situations where parabolic motion occurs?

Examples include the motion of a soccer ball kicked into the air, the trajectory of a missile, and the path of a baseball hit into the field.