Rules briefly
What is Physics Brawl Online?
Up to 5 high school students compete from home in a 3-hour long contest in solving physics
problems.
There are 7 problems available for you. As soon as you solve one, you get another problem
immediately. For each solved problem the team is awarded with points.
The best teams win prizes and undying glory in our competition, which has been held
annually for over a decade now.
What are the prizes?
We have rewards for the best of you.
Problem examples
Everyone finds suitable difficulty.
A coniferous tree could be (from a mechanical point of view) approximated by a homogeneous
right circular cone with height h = 40 m and radius at the base r = 1.0 m. Find the maximal
angle by which its axis may be displaced from the vertical axis before it starts to fall due to its
weight.
A h = 30 m high waterfall has flow rate Q = 1,2 m^{3}·s^{-1}. Find the total force with which water
impacts the ground under the waterfall. Assume that the water quickly flows away from the
point of impact and the depth of water under the waterfall is negligible.
Find the resistance between two neighbouring vertices of a four-dimensional cube made of wire.
Each edge of the cube has a resistance R = 1 000 Ω.
Vítek would like to get some water from his well, but he does not want to keep pulling the
bucket up. Therefore, he gradually stirred the water around faster and faster until, at an angular
velocity ω = 11 rad·s^{-1}, the water started flowing out of the well all by itself. Vítek knows the
depth of the well (from the top edge to the ground at the bottom) h = 47 m. The well has
a circular cross-section with a radius r_{0} = 1,6 m. What was the height of the water column
(from the bottom of the well to the water surface) before Vítek started spinning the water
around?
Competition schedule
The contest takes place on Wednesday November 22, 2023
Beginning of the contest
Participants get 7 problems. Once they solve any of them, they immediately get another.
Hurry up!
Another series of problems appears, with problems related to different physics fields. For the next half an hour, participants can achieve bonus points for solving the series.
End of bonus points in the Hurry up! series
Problems from Hurry up! are still available but without bonus points.
End of the competition
The competition is over. We publish the author's solutions and settle potential conflicts.
Deadline for complaints
We close the possibility to complain and prepare to publish the official winners during the upcoming days.
Registration
Sign up and become a legend!
- Participation is free for anyone!
- Registration is open from September 1 until November 22, 15:00 CET.
- Except for communicating with other teams, you can use any tools to solve the problems.
2022
S.I.M.P.S.
Đức Huy Trần, Eddie Chen, Quan Nguyen, Tung Tran, Zhening Li
2021
Metaphysical Brawlers
Đức Huy Trần, Nam Nguyen Hoang, Mạnh Quân Nguyễn, Tung Tran, Ung Nguyen
2020
The Large Noobs Collider
Tung Tran, Mạnh Quân Nguyễn, Đức Huy Trần, Tan Nguyen, Ung Nguyen
2019
Temple of Next
Anthony Ou, David Xiong, Vincent Bian, Raymond Li, Sanjay Raman
2018
NOFY066
Patrik Švančara, Jan Brandejs, Jakub Kocák, Jan Sopoušek, Ján Pulmann
2017
FtáKopySk -fks.sk
Dušan Kavický, Filip Kubina, Matej Badin, Jakub Cimerman, Michal Hledík