The drag of the object.

Drag can be used to slow down an object. The higher the drag the more the object slows down.

	function OpenParachute() {
		rigidbody.drag = 20;
	}
	
	function Update() {
		if (Input.GetButton ("Space")) {
			OpenParachute();
		}
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void OpenParachute() {
        rigidbody.drag = 20;
    }
    void Update() {
        if (Input.GetButton("Space"))
            OpenParachute();
        
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def OpenParachute() as void:
		rigidbody.drag = 20

	def Update() as void:
		if Input.GetButton('Space'):
			OpenParachute()