VIDEO PRAKTEK MENGAJAR MODUL AJAR KELAS 4 SD SEMESTER 1 BAB 3 FASE B TOPIK C "BENDA YANG ELASTIS"

Summary

In this educational session, the teacher engages students in learning about elastic materials and forces. The lesson includes discussions about elastic objects, such as rubber bands and slingshots, exploring how they stretch and return to their original shape. Students perform experiments to observe the effects of forces, including tension and compression, on elastic materials. The lesson concludes with interactive quizzes and a homework assignment for students to explore examples of elastic objects used in sports. The session emphasizes understanding elasticity, forces, and real-life applications of these principles.

Takeaways

• 😀 Students start the lesson by greeting the teacher with 'Asalamualaikum' and engage in a prayer before beginning the lesson.
• 😀 The class starts with a roll call where students respond affirmatively, confirming their attendance.
• 😀 Students sing the Indonesian national anthem 'Satu Nusa Satu Bangsa' as part of the opening activity.
• 😀 The topic for this lesson is elastic objects, with the teacher first reviewing the previous lesson on magnets.
• 😀 Elastic objects are defined as those that can return to their original shape after being stretched or deformed by force.
• 😀 The teacher explains the concept of 'elasticity' using examples like rubber bands, where pulling or stretching the material demonstrates its elastic properties.
• 😀 The lesson introduces forces such as 'tension' (pulling force) and 'compression' (pushing force) that are at play in elastic objects.
• 😀 A video is shown to the students to further demonstrate the concept of elasticity using examples like slingshots and rubber bands.
• 😀 After watching the video, students discuss how tension and compression are involved when a slingshot is used to shoot a stone.
• 😀 The class concludes with a hands-on activity where students conduct experiments with rubber bands and paper balls, testing how the elastic materials react to forces applied by stretching and releasing.

Q & A

What is the main topic discussed in the class?

The main topic discussed in the class is about elastic objects and the forces that affect them, such as tension and compression.

What is the definition of elastic objects according to the teacher?

Elastic objects are materials that can return to their original shape after being stretched or compressed. They maintain their original shape after the applied force is removed.

Can you explain what a 'spring force' is, as mentioned in the class?

A spring force is the force that allows an elastic object, such as a rubber band, to stretch or compress. It enables the object to return to its original shape when the applied force is removed.

What does the teacher say about how to test elasticity?

The teacher demonstrates how to test elasticity using a rubber band. By stretching the rubber band and releasing it, the rubber band returns to its original shape, showing the behavior of an elastic object.

What are the two forces mentioned in the class that affect elastic objects?

The two forces mentioned are tension (the force that stretches the object) and compression (the force that pushes the object together).

How did the teacher explain the concept of a catapult in relation to elasticity?

The teacher explained that a catapult works by using an elastic object, such as a rubber band, to store potential energy. When the rubber band is stretched and released, it exerts a force that launches the object (like a stone) forward.

What were the students required to do in the class's experiments?

Students were divided into two groups and tasked with performing two experiments. The first involved stretching a rubber band, and the second involved using the rubber band to launch a paper ball.

Why is it important to use enough force when stretching a rubber band in the experiments?

Using enough force is necessary because stretching the rubber band too little will not provide enough energy to propel the object effectively, while stretching it too much could cause the rubber band to break.

What were some examples of elastic objects given by the teacher?

Examples of elastic objects mentioned by the teacher include rubber bands, springs, arrows, and trampoline mats.

What did the teacher want to assess with the quiz at the end of the lesson?

The teacher used the quiz to assess the students' understanding of elastic objects, the forces that affect them, and the examples of such objects. It also helped to confirm that students grasped the concepts of tension and compression.