# Questions tagged [physics]

Physics is a science that studies the interactions of energy and matter. The physics tag should be used for questions about how physics can be simulated or implemented in programming.

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43 views

### Diffusion Limited Aggregation Simulator

Based on my answer to another code review question I wrote my own python script for DLA (Diffusion Limited Aggregation). The DLA algorithm task: Place seed at the center of the canvas. Release a ...
54 views

### N-Body Gravitational Simulation of Point-Masses in Python

I made an n-body gravitational simulation in python. The algorithm does produce an approximate solution, which is shown at the bottom of the post. Additional methods to produce animations (among other ...
53 views

### Modelling solar system, Runge-kutta 4 (n-Body problem)

I have a program that simulations all planets, where the forces due to each planet is considered during each time step.I'm looking to see where I could make some improvements. main.cpp ...
167 views

### Simulating a Solar System Using Command-Line Graphics

After a relative hiatus of around two years, I've decided to start delving back into the programming world; to start, I've appropriated one of my older projects, CLIGL, and have made a solar system ...
4k views

### Simple n-body class in C++

As part of my training, I implemented a n-body class in C++ to simulate gravitational interaction of bodies and to get more familiar with features that C++ offers such as object oriented programming. ...
90 views

### Optical dispersion calculation from spectrograms with Python

First, I'd like to provide a little explanation on what my code is supposed to do. It is part of a middle-sized project. I restructured the code to work on its own, and also added little comments to ...
74 views

### d3.js canvas performance

I've just rewritten this code (a simple gravitational restricted n-body simulation) to display using canvas, rather than SVG. The reason being that I'd like to be able to run it with many thousands of ...
63 views

### Making basic physics object class

I'm creating a 2D game in JS, and I've made the generic class that all objects in the game will be (I've decided they are all circular for now). An object has ...
100 views

### Simplified three-body simulation

The code below simulates a given Newtonian 3 body system. Each row per slice is supposed to represent a Cartesian component for the initial trajectory vector and for the distance vectors to the other ...
107 views

### Trapezoidal rule for set of data

Here is the question from the book of Mark Newman-Computational Physics Exc 5.1 a) Read in the data and, using the trapezoidal rule, calculate from them the approximate distance traveled by the ...
54 views

### Simple spatial grid for particle system

I am going to simulate a particle system, the particles are infinitesimal points which apply forces on the neighbors and I need a fast way of making proximity checks, they are going to have a maximum ...
43 views

### Repelling particles from one another while attracting them to a location

I am trying to repel PNGs as particles from one another while attracting them to a location. I am not sure if I've done it correctly, I'd like to be sure before I continue further. ...
167 views

### Gravity simulation using Numpy and Pygame

This is a simple gravity simulator coded in Python 3.7 using Numpy and Pygame. I was wondering if it can be optimized further. Initially I had coded it using pure Python lists, using nested loops to ...
69 views

### Butter side up?

I've written a piece of code that determines if a piece toast with butter lands on the butter-side or not, depending on its initial velocity and the table height. The code is written in Mathematica ...
208 views

### Simulation of spring-loaded inverted pendulum

I've finally committed to moving to Python 3 from MATLAB. I'm currently porting my MATLAB code, and I'm sure I'm missing a lot of common best-practices. For reference, I'm simulating a spring-loaded ...
184 views

### Golf Physics “Game”

Continuation of this post I wrote a program in pygame that basically acts as a physics engine for a ball. You can hit the ball around and your strokes are counted, as well as an extra stroke for ...
2k views

### Ising model simulation

I have written this code to simulate Ising Model at one particular temperature in presence of magnetic field to observe hysteresis effect using the metropolis algorithm. While the code runs and gave ...
923 views

### Golf game boilerplate

I wrote a program in pygame that basically acts as a physics engine for a ball. You can hit the ball around and your strokes are counted, as well as an extra stroke for going out of bounds. If I do ...
109 views

### Perturbed phase oscillator integration

I am integrating a system of perturbed phase oscillators. I define the system of equation and also the Jacobian matrix. I have to reshape the one dimensional vector of system state to a 2 dimensional ...
302 views

### Simple Flappy Bird Clone using Kivy (with very minimum physics)

This is a very simple clone of Flappy Bird using Kivy, to be used for programming class for teens. The game consists of 3 classes: Bird, ...
2k views

### Simulating a two-body collision problem to find digits of Pi

I came across a nice video on 3Blue1Brown's channel that highlights a very indirect way to find the digits in Pi. I'd suggest watching the whole video, but briefly: The setup is as above. A "small" ...
140 views

### Very slow frame rate in C++ N-body simulation using Barnes-Hutt and RK4

I am writing the code for my EPQ project and am aiming to produce a graphic showing the collapse of a particle cloud with around 10^5/6 particles. My current code will spawn a specified number of ...
74 views

### Calculate supporting forces of a simply supported beam

The program uses a very simple algorithm to calculate the supporting forces of a simply supported beam. I'd like to know if thorwables are good practice to handle semantic errors and if one should ...
112 views

### Vector addition and Pythagorean Theorem code

I would like to share my code that is meant to help me add 2 vectors together. It is very simple and I would like to kindly ask you whether you could review my code. Also, I decided to keep separate ...
90 views

### Modeling a capacitor with DC Bias

I am modeling a capacitor which has its capacitance varying according to the DC Bias. The DC Bias is computed by taking the mean of the voltage across the capacitance. ...
178 views

### Calculate next position and velocity after “bounce”

Intro and code I have the following function that calculates an object's "next" position and velocity (in 1 dimension) given a boundary [0, max]. ...
82 views

### Pong Game in JS

I am new to game development and took on the task to create a Pong replica due to my curiosity and interest in the field. I decided to write it in JavaScript because the game is not too labor ...
6k views

### Car crash reaction time

In physics class we are doing an investigation thing. Some of the numbers might seem plucked out of thin air but they aren't. The maths is right(I think) I just want some feedback on the code. ...
502 views

### Simulating a system of moving points

This is an update of the code from my previous question. I'm simulating a system of particles which interact with each other and move and rotate due to the interaction. There are 2000 particles in ...
317 views

### Simulation of interacting particles [closed]

I'm simulating a system of particles which interact with each other and move and rotate due to the interaction. There are 2000 particles in total but each particle interacts with other particles and ...
1k views

### Simulating motion of particles

Description The code does particle simulation. In this code, some particles take steps with a certain distribution length. if particles go beyond a curve, the code put them back. Code ...
2k views

### Calculating work using dot product in C++

Write a C++ program fulfilling the following task: The user should enter the 3 dimensional force vector F and a 3 dimensional length vector s. The force is assumed to be constant. The program then ...
351 views

### Cross product to find Lorentz force in C++

User enters velocity vector $v$, charge $q$ of particle and magnetic field vector $B$ and the code prints the Lorentz force $F = q * (v * B)$ ...
436 views

### Feynmann lifeguard riddle graphical representation

Physicist Richard Feynman though of a very interesting riddle: Imagine you are a lifeguard at the side of the beach and there is a child drowning in the water. (You must cross both sand and water ...
154 views

### Closed particle system simulation in vanilla Javascript

I have ported my simulation from Java to vanilla Javascript. The most important aim was to keep the sum of all energies constant. I have this: simulation.js ...
575 views

### Simulating a closed particle system in Java

I have this program that simulates a closed particle system. Closed in this context means that the sum of all energies is constant. My primary concern is code itself, yet I would like to hear comments ...
33 views

### NodeJS module to calculate linear motion

I am on the process of changing jobs, so I would like to get an idea of what I do wrong in order to improve. For this, I have created a small node module. It's very simple; it calculates linear ...
567 views

### Metaballs and Gravity game;

For past two days I made my first OpenGL project, I know, It's fixed pipeline, but my focus was on gravity algorithm, so, tell what do you think, and how can I make it faster? main.cpp ...
2k views

### 2D Physics Simulation (game-like)

My program is meant to simulate 2D physics(hopefully 3D as well in the future), namely classical mechanics and eventually electromagnetism. Currently it simulates projectile motion by firing a ...
4k views

### My first Physics Engine C++

I have made my first physics engine for simulating circles in a plane. Let me know what you think about it. ...
483 views

### Calculating energy from mass and light speed

I'm learning Java JDK 1.8 since one day and I'm using Java's methods to the first time. I have never used Java before because I'm a Python/Django developer. I created a method which let to get energy ...
366 views

### Complex scientific formula for nuclear magnetic resonance

I've been reading "clean code" tutorials, and I definitely see the value of using good names that "document themselves" to make intent clear. However, what can be done about complex formulas where ...
528 views

### Distance and force calculation for a molecular dynamics simulation

I'm writing an MD-like simulation and I'm having some difficulties in making this code run faster. I profiled the code using callgrind and kcachegrind, and it appears I'm using about 30% of my time on ...
991 views

### Calculators for gas law equations

I've made a C++ program that calculates a missing variable in an equation for one of the five following laws of gas: Boyle's Law Charles' Law Gay-Lussac's Law Avogadro's Principle Ideal Gas Law The ...
3k views

### Kinematic Equations

I'm learning the kinematic equations in Concepts of Engineering and so here are the equations I am learning: To complete the lesson, I was told to create a Python program that outputs the horizontal ...
242 views

### “Do I understand the gravity of the situation?”

What is this? This is a two-dimensional physics simulator that models gravity and collisions between circular objects (though it doesn't model rotation). How do you use it? You can tweak the ...
78 views

### Accurately calculating gravity for large systems

I'm in the middle of a program to simulate gravity between particles for > 50000 particles. It works so far, but the way I calculate gravity seems to be a tad askew. Generally, it works. It fails when ...
116 views

### Calculating a table of deBroglie wavelengths for various electron energies

Here is the formula for the deBroglie wavelength of an electron versus its kinetic energy: $$\lambda(E_k) = h\left/\sqrt{\frac{(E_k+m_eC^2)^2-m_e^2C^4}{C^2}}\right.$$ and here is simple script that ...