Egg Joust 2017 5:30PM on January 10th in the Upper GYM


Your group will design and construct a car to compete in the GHS Physics Egg Joust Competition. The car, propelled only by a mousetrap, must move a distance of 60.0 cm then proceed down a 0.72-meter 33° incline carrying a knighted egg. Your goal is to (a) knock the other person’s egg out of its seat while staying in yours unbroken, (b) break the other egg while sustaining no damage to your own, and/or (c) be the first car to the “point of no return”.


  • Design & construct a car powered by only a mousetrap (NO RAT TRAPS)
  • Maximum Dimensions: 33 cm length x 25 cm width
  • Minimum Distance Required to Move: 60.0 cm (to front edge of incline)
  • Must have space in front of car to house an egg saddle (bottom portion of an egg carton) and egg. The space for the rider may be protected but nothing may come within 1 cm of touching the egg. The top half of the egg must be exposed the entire joust (i.e., no coverings, enclosures, etc.)
  • The front of the egg must be a maximum of 6 cm from the front most edge of car.
  • The dimensions of the car must remain under the maximum dimensions at the start of the race but may “unfold” after the start of the match. Nothing may be left behind at the starting line. The entire vehicle has to move 60 cm.
  • Teams must be represented by at least two members the night of the competition. Full participation is encouraged.
  • Groups must design a Egg Joust art piece that represents their team. It can be digitally created or created by hand.


  • Use caution when using/setting mousetraps.
  • Testing cars on the jousting inclines will be allowed before night of the competition, however, no informal jousting will be allowed (even without eggs).


Competition Night:

  1. Teams will be randomly placed in the tournament bracket
  2. The bracket will be posted (order of play is predetermined)
  3. Teams will have one minute to get set up after cleanup from previous round ends. (This is where most teams have been disqualified in the past.)
  4. The tournament will be single-elimination
  5. Various awards will be given

Winning a Round

A matchup win is determined by the following conditions:

Knock opponents’ egg out of saddle while keeping yours in
(First tiebreaker) Break opponents’ egg while keeping yours unbroken
(Second tiebreaker) If both eggs have same outcome (both broken, both unbroken, etc…), make it to “point of no return” first
(Third tiebreaker) Judges’ decision (all decisions final - judges have authority to edit/add/remove/interpret rules as they see fit)

The design and building of the car will occur over the course of the week leading up to the final competition on Tuesday, January 10th at 5:30 p.m. Parents and friends are encouraged to attend!

Portfolio Requirements:

Each group will create a portfolio of their project. The portfolio will include force diagrams, qualitative motion graphs, written and visual documentation of the process, and a reflection on the success/failure of the project.

Process Documentation:

A typed journal must be kept documenting when that the car was worked on and who worked on it. Include information regarding the tasks accomplished along the way and include multiple photographs in a Google Presentation. Evidence of Twitter use (#eggproject) resulting in team publicity (interactions with other users) will earn extra credit.

Force Diagrams:

Should be clean and easy to read. Need to include a diagram for each stage of one contest (at rest, speeding up, moving with a constant velocity, free fall, hitting the ground). All forces must be labeled and in (on,by) notation.

Qualitative Motion Graphs:

Position-time, velocity-time, acceleration-time graphs should be included for your car and your egg. All stages of the contest should be represented and labeled in these graphs. Make sure your starting positions, starting velocities, and starting accelerations are correct and the shape of your graphs are accurate too.

Written Reflection:

The reflection should be completed after the competition night. It should include thoughts on the process, your definition of success, your level of success, and what you would do differently if you could do it over. Also rank each partner's effort 0 to 10 with 10 being the best, include reasons on how you ranked their effort.

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