🎉 Initial commit

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "free-fall-sim"
+version = "0.1.0"
+dependencies = [
+ "physical_constants",
+]
+
+[[package]]
+name = "memchr"
+version = "2.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+
+[[package]]
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+dependencies = [
+ "regex",
+]
+
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"

Cargo.toml

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+[package]
+name = "free-fall-sim"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+physical_constants = "0.5.0"

src/main.rs

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+#![allow(non_snake_case)]
+
+use physical_constants;
+use std::{thread, time};
+
+fn main() {
+    let f = 100_f64;  // Hz
+    let time_delta = 1_f64 / f;  // s
+    let speed_dial = 1_f64;
+    let pause = time::Duration::from_millis((time_delta * 1000_f64 / speed_dial) as u64);
+
+    let mass = 1_f64;  // kg
+    //let A = 0.0025_f64;  // m^2
+    let A = 1_f64;  // m^2
+    let Cd = 0.5_f64;
+    let p = 1.204_f64;  // kg/m^3
+
+    let Fg = mass * physical_constants::STANDARD_ACCELERATION_OF_GRAVITY;  // N
+    let mut Fd = 0_f64;
+
+    let mut a;  // m/s^2
+    let mut v = 0_f64;  // m/s
+    let mut d = 0_f64;  // m
+    let mut elapsed = 0_f64;
+
+    loop {
+        a = (Fg - Fd) / mass;
+        v += a * time_delta;
+        d += v * time_delta;
+
+        print!("t = {:.3} s    Fg = {:.3} N    Fd = {:.3} N    a = {:.3} m/s^2    v = {:.3} m/s    d = {:.3} m\r", elapsed, Fg, Fd, a, v, d);
+
+        Fd = p * Cd * A * v.powf(2_f64) / 2_f64;
+        elapsed += time_delta;
+
+        thread::sleep(pause);
+    }
+}