lvjincheng_chengbao/Assets/Scripts/CollisionEnter.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CollisionEnter : MonoBehaviour
{
    private Rigidbody rigidbody;
    // Start is called before the first frame update
    void Start()
    {
        rigidbody = GetComponent<Rigidbody>();
        if (rigidbody == null)
        {
            rigidbody = gameObject.AddComponent<Rigidbody>();
        }
    }
    private void OnCollisionEnter(Collision collision)
    {
        //print(name +"   " + collision.gameObject.name);
        rigidbody.useGravity = true;
        rigidbody.mass = 0.1f;
    }

    // Update is called once per frame
    void Update()
    {
       // transform.position = new Vector3(transform.position.x, transform.position.y - 0.01f * Time.deltaTime, transform.position.z);
    }
}