frame-independent-dampen.js

var FRAME_TIME = 1000 / 60;
var DAMPING = 0.945;

function applyDamping(vel) {
	return vel * DAMPING;
}

function applySpeed(x, vel) {
	return x + vel;
}

function decelerate(v0, frames) {
	console.log(frames, 'decelerate', v0);

	var x = 0;
	var v = v0;
	var f = 0;

	var ld = new Date();
	var rd = 0;

	var iid = setInterval(function () {
		var d = new Date();
		var dt = d - ld;

		rd += dt;

		while (rd >= 0) {
			v = applyDamping(v);
			x = applySpeed(x, v);

			rd -= FRAME_TIME;
			f++;

			if (v <= 1)
			{
				clearInterval(iid);

				console.log(frames, 'finish', x, v, f);
				console.log(frames, '---');
				break;
			}
		}

		ld = d;
	}, 1000 / frames);
}

decelerate(100, 1);
decelerate(100, 5);
decelerate(100, 40);
decelerate(100, 100);
decelerate(100, 200);