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Mrs. Hulstrom |
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Code HS
Karel the Dog class code: 1251
Lesson 9 - The Physics Engine
In this lesson, we’re going to learn how to activate the physics engine in our projects and how to apply gravity to actors.
Lesson Objective
At the end of this lesson students will be able to:
- Activate the physics engine.
- Set up and apply gravity to multiple actors.
Introduction
What physics?
Physics is the study of forces and their impacts on the environment
- Many of the most popular video games wouldn’t exist without physics, would they? Any time one object or character collides with another one what you see if physics in action. Does anyone have any examples of physics?
Vocabulary
- Physics - physics is the study of forces and their impacts on the environment.
- Gravity - the force that causes objects to fall to the ground.
New Blocks
The blocks we will be learning about in this lesson are ‘on start’, ‘start physics’, ‘set gravity to’, ‘set shape to’, ‘point in direction’, and ‘go to x y’.
Lessons
1. Introduction
2. Play the Game Cannon Crasher Game
Read the instructions on the screen so you understand the rules of the game.
- Move the mouse to aim
- hold the mouse down to add impulse
- Release the mouse button to shoot
3. Concepts
Let’s find out more about the physics engine.
5. Stack the Blocks
In this tutorial we’re going to learn how to use the physics engine to make two rectangular blocks stand up on their sides. Follow along with me as we work through some practice examples. Click on the ‘Stack the Blocks’ icon.
Read the text and click the Play button and watch as the blocks appear to bounce up and then land again on their edges
Step 1 - Start Physics
Now we’re going to add the background, actors and the code to start the physics engine. I’m going to demonstrate and I want you to follow along.
- Follow the prompts and demonstrate as students follow along.
- Encourage students to ask questions and help one another.
- Here is the completed code
Step 2 - Code for the Left Wall
Now we’re going to add the background, actors and the code to start the physics engine.
Step 3 - Code the Right Wall
6. Stack 'em Up
In this puzzle we need to code the top block so it is stacked properly on top of the other two blocks.
Step 1: What should the Set Shape block be assigned (rectangular or round)?
Step 2: What direction should the ‘point in direction’ block be set to?
7 & 8 - Example and Make Your Own Structure
Use what you have learned to complete your own game structure!
9. Quiz
When you have successfully made your own structure, save your project and take the quiz. If you had any problems with the quiz go back and review the module you had difficulty with.
Conclusion
In this lesson we learned how to add physics to a project. We also learned how to add gravity to actors and how to set the shape of actors so they move realistically when set into motion.
Transfer Learning
Now that you know how to add physics to your projects the possibilities of what you will be able to create are endless! Practice adding physics to many different actors of varying shapes and sizes. Also try experimenting with the ‘set shape’ block to observe how this setting affects the motion of the objects. You should also try adjusting the ‘point in direction’ values and observe the affect this has on your objects. The more you practice the better you will understand the physics engine and how to use it in your projects.
U.S. Standards
- K-12 CTSA Computer Science Standards (Revised 2017)
Computer Science Teachers Association:- 1B-AP-10
- 1B-AP-11
- 1B-AP-12
- 1B-AP-15
- 2-AP-12
- 2-AP-13
- 2-AP-15
- 2-AP-16
- 2-AP-17
- CCSS-ELA: RF.5.4.A, 6-8.RST.3, 6-8.RST.4, 6-8.RST.7
- CS CA: 3-5.AP.10, 3-5.AP.12, 3-5.AP.13, 3-5.AP.14, 3-5.AP.17, 6-8.AP.12, 6-8.AP.13, 6-8.AP.16, 6-8.AP.17
- ISTE: 1.c, 1.d, 4.d, 5.c, 5.d, 6.b