Purpose : Students should learn how to use abstraction to simplify complex programs by using custom blocks and organizing them in a structured way. This builds clearer logic, easier debugging, and reusable code.

Exercise:1

---

1. Create a Solar System animation in Scratch where each planet revolves around the sun using cloning and custom blocks. (Different clones perform different tasks). You have to use only one sprite for the sun and one for all the 8 planets.

Exercise Video

---

• To download the sb3 file in which they use 8 sprites for 8 planets. Use this sb3 file to abstract and complete the exercise-1.


• Click here to download the sb3 code with bugs.

Solutions

---

• Click here to download the sb3 file for the exercise-1.

1. Recap key Scratch blocks, focusing on events, loops, and custom blocks.
2. Emphasize the difference between repeated code and reusable code using abstraction.
3. Help students to break problems into smaller parts and assign each to a basic block (When space key pressed, up arrow pressed, When I start as a clone...)
4. Help them see the difference between Sprite variables and global variables. Explain how there are multiple copies of the Sprite variables. All the properties of sprites like (X, Y position, motion, costume etc. will also be maintained in multiple copies.
5. Recall to them about RAM and storage they learnt last year. Help them understand how we have a code area and the data area and how these are all stored in the memory (RAM).
6. Highlight how abstraction helps with debugging and reusing code in larger projects.