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Scratch coding environment showing a cat sprite and motion commands

Scratch programming interface with cat sprite and motion blocks

Scratch programming interface with cat sprite and motion blocks

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Show Answer Key & Explanations Step-by-step solution for: Computer Programming for Kids | Worsheets library
The image you provided shows a Scratch programming environment with a sprite (the cat) and some motion blocks already placed in the script area. The task appears to involve creating or modifying a program using these blocks. Below, I will analyze the problem and explain how to solve it step by step.

---

Analysis of the Problem


1. Sprite and Blocks:
- The sprite is the default Scratch cat.
- The motion blocks visible include:
- `move 10 steps`
- `turn 15 degrees` (clockwise and counterclockwise)
- `point in direction 90`
- `point towards mouse-pointer`
- `go to x: 0 y: 0`
- `glide 1 secs to x: 0 y: 0`
- `change x by 10`
- `set x to 0`
- `change y by 10`
- `set y to 0`
- `if on edge, bounce`
- `set rotation style left-right`

2. Objective:
- The task likely involves using these blocks to create a specific behavior for the sprite. Since no explicit instructions are given, we can infer that the goal might be to make the sprite move dynamically based on certain conditions or inputs.

3. Key Observations:
- The `point towards mouse-pointer` block suggests that the sprite's movement might be influenced by the position of the mouse.
- The `if on edge, bounce` block indicates that the sprite should bounce off the edges of the stage if it reaches them.

---

Solution Approach


To create a dynamic and interactive program, we can combine the blocks to make the sprite follow the mouse pointer while bouncing off the edges of the stage. Here’s how to achieve this:

#### Step 1: Set Up the Initial Position
- Use the `go to x: 0 y: 0` block to set the initial position of the sprite at the center of the stage.

#### Step 2: Make the Sprite Follow the Mouse
- Use the `point towards mouse-pointer` block to orient the sprite toward the mouse pointer.
- Use the `move 10 steps` block to make the sprite move forward in the direction it is pointing.

#### Step 3: Add Edge-Bouncing Behavior
- Use the `if on edge, bounce` block to ensure the sprite bounces off the edges of the stage if it reaches them.

#### Step 4: Combine the Blocks
Arrange the blocks in a loop to continuously update the sprite's position and orientation. This can be done using a forever loop (`forever` block), which is available in the Control category.

---

Final Script


Here is the sequence of blocks to achieve the desired behavior:

1. Forever Loop:
- Drag the `forever` block from the Control category into the script area.

2. Point Towards Mouse:
- Inside the `forever` loop, add the `point towards mouse-pointer` block.

3. Move Forward:
- Add the `move 10 steps` block inside the `forever` loop.

4. Edge Bouncing:
- Add the `if on edge, bounce` block inside the `forever` loop.

5. Initial Position:
- Outside the `forever` loop, add the `go to x: 0 y: 0` block to set the initial position.

#### Complete Script:
```
when green flag clicked
go to x: 0 y: 0
forever
point towards mouse-pointer
move 10 steps
if on edge, bounce
end
```

---

Explanation of the Solution


1. Initialization:
- The sprite starts at the center of the stage (`go to x: 0 y: 0`).

2. Continuous Movement:
- The `forever` loop ensures that the sprite continuously updates its position.
- The `point towards mouse-pointer` block makes the sprite always face the mouse cursor.
- The `move 10 steps` block moves the sprite forward in the direction it is facing.

3. Boundary Handling:
- The `if on edge, bounce` block checks if the sprite has reached the edge of the stage. If so, it reverses the direction of movement, causing the sprite to bounce back.

4. Dynamic Interaction:
- The sprite's movement is dynamic and responsive to the mouse pointer's position, providing an interactive experience.

---

Final Answer


The complete script to achieve the described behavior is:

```scratch
when green flag clicked
go to x: 0 y: 0
forever
point towards mouse-pointer
move 10 steps
if on edge, bounce
end
```

This script ensures that the sprite follows the mouse pointer while bouncing off the edges of the stage.

Boxed Final Answer:
\boxed{
\text{when green flag clicked} \\
\text{go to x: 0 y: 0} \\
\text{forever} \\
\quad \text{point towards mouse-pointer} \\
\quad \text{move 10 steps} \\
\quad \text{if on edge, bounce} \\
\text{end}
}
Parent Tip: Review the logic above to help your child master the concept of computer programming worksheet.
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