GAME2005 – Game Physics

Assignment 2
Projectile Motion, Circular Motion, Free body diagrams and
Newton's Laws
Due week #7 (Friday October 23, 2020) @ midnight.
Value 10%
Maximum Mark: 100
Overview: Please complete all questions sections of the assignment with your group
members. The best way to complete the assignments is to complete as much of the work as
possible on your own. Then, get together with your group members to compare what you
have and share ideas, submitting the best assignment possible.
Your group will choose one of the questions to use when developing a short simulation with
C++ and the SDL framework.
Instructions :

Part 1: Physics Problem

1. Consider a metal loot crate, at the top of a frictionless ramp. If the mass of the loot crate is
12.8kg and the ramp has a rise of 3m and a run of 4m, then compute the following.
a) Compute the free body diagram of the loot crate a time 0. (i.e. when the loot crate is at
the top of the ramp.) (5 Marks)
b) Compute the net force and the acceleration of the loot crate at time 0. Given the
frictionless surface what do we know about the acceleration as the object moves down
the ramp? (5 Marks)
c) Consider the loot crate as it leaves the ramp and moves onto a at surface that now has
some friction. Compute the free body diagram for this situation. If coefficient of kinetic
friction is 0.42 (steel on steel), calculate the new net force and acceleration. (5 Marks)
d) If we assume that the force of friction is constant after this point, how long will it take
for the loot crate to stop moving? At what distance in meters will the loot crate stop? (5
Marks)
e) Include a short document (report) that includes a diagram that illustrates the problem
and your solution. Ensure you include appropriate labels and show your work (10 Marks)

Part 2: Physics Simulation

2. You will use C++ and the SDL Framework to create a scene which simulates the motion of the
“particle” in the problem from Part 1.
a) Your application should include a Start Scene with labels that show Team members’
names and student IDs. A button or other control will allow the user to go to the Play
Scene where all the fun happens (5 Marks: GUI)
b) Your Play Scene should include appropriate assets for the Physics Simulation. You should
include a background image or Tile-Map (10 Marks: GUI)
c) Choose an appropriate scale for your scene (i.e. pixels per meter – PPM). Add
appropriate variables and data structures (10 Marks: Functionality)
d) Move the asset that represents the “particle” in the scene according to the problem
described above. Let the user “activate” the scene with a button or other control (10
Marks: Functionality)
e) Use appropriate label objects in your scene to show key statistics which may include
mass, position, velocity, acceleration, force, etc. (you may use ImGui for this as it has
been included with your template). (5 Marks: GUI, 5 Marks: Functionality)
f) Allow the User to change the variables (e.g. width and height of the ramp, mass of the
loot crate, coefficient of kinetic friction, etc.). Update your Display Accordingly. (10
Marks: Functionality)

Part 3: Video Demonstration

3. Create a Short Video presentation with your favourite screen capture and streaming tool (OBS
Recommended) and upload it to Blackboard. You must also include a short PowerPoint (or
Google Slides) Slide Deck that includes a single slide to start your video (10 Marks: Video Demo)
a) The first (and only) Slide of your Slide Deck must include a current image of you and
your partner(s) (no avatars allowed) that is displayed appropriately on the page. You
must also include your Full Name(s), Student ID(s), the Course Code, Course Name, and
your Assignment information. (2 Marks: video)
b) You will demonstrate each of your app’s Scenes. Your UI must be clearly visible (2
Marks: Video)
c) You will describe the code and functionality of your application (2 Marks Video).
d) Sound for your Video must at an appropriate level so that your voice may be clearly
heard. Your Screen should be clearly visible (2 Marks: Video).
e) Your Short Video should run no more than 5 minutes (2 Marks: Video).

Part 4: Version Control

4. Share your files on GitHub to demonstrate Version Control Best Practices
a) Create an appropriately named repository on GitHub (1 Marks: Version Control)
b) Your repository must include your code and be well structured (2 Marks: Version
Control).
c) Your repository must include commits that demonstrates the project being updated at
different stages of development – each time a major change is implemented (2 Marks:
Version Control).

Evaluation Criteria
Feature Description Marks
Physics Problem A short report has been created for your physics problem. The math works and
does not contain any errors. A diagram accompanies your problem and is labelled
appropriately.
30
Physics Simulation UI UI Controls meet the application requirements. Display elements are deployed in
an attractive manner. Appropriate contrast is applied to application UI Controls and
any background colours applied so that all text is legible.
20
Physics Simulation
Functionality
Your Simulation works without errors. Controls are available for the user to modify
the initial values and restart the simulation with those values.
35
Video Presentation Your short video must demonstrate your app working in the simulator and discuss
10
Total 100

1. A MS Word or PDF document that shows your work for your Physics Problem.
2. Include the Name and StudentID of each team member at the top of your document.

This assignment is weighted 10% of your total mark for this course.

Late submissions:
• 20% deducted for each additional day late.

Email:51zuoyejun

@gmail.com