// Apply a force to a clicked rigidbody object.
    
    // The force applied to an object when hit.
    var hitForce: float;
    function Update() {
        if (Input.GetMouseButtonDown(0)) {
            var hit: RaycastHit;
            var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            
            if (Physics.Raycast(ray, hit)) {
                if (hit.rigidbody != null)
                    hit.rigidbody.AddForce(ray.direction * hitForce);
            }
        }
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public float hitForce;
    void Update() {
        if (Input.GetMouseButtonDown(0)) {
            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit))
                if (hit.rigidbody != null)
                    hit.rigidbody.AddForce(ray.direction * hitForce);
                
            
        }
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public hitForce as single

    def Update():
        if Input.GetMouseButtonDown(0):
            hit as RaycastHit
            ray as Ray = Camera.main.ScreenPointToRay(Input.mousePosition)
            if Physics.Raycast(ray, hit):
                if hit.rigidbody != null:
                    hit.rigidbody.AddForce((ray.direction * hitForce))