RigidbodyExt.cs

using UnityEngine;

public static partial class RigidbodyExt
{
    public static void AddForceD(this Rigidbody aRB, Vector3 aForce, ForceMode aMode = ForceMode.Force)
    {
        switch(aMode)
        {
            case ForceMode.VelocityChange:
                aRB.velocity += aForce;
                break;
            case ForceMode.Impulse:
                aRB.velocity += aForce / aRB.mass;
                break;
            case ForceMode.Acceleration:
                aRB.velocity += aForce * Time.fixedDeltaTime;
                break;
            case ForceMode.Force:
                aRB.velocity += aForce * Time.fixedDeltaTime / aRB.mass;
                break;
        }
    }
    public static void AddRelativeForceD(this Rigidbody aRB, Vector3 aForce, ForceMode aMode = ForceMode.Force)
    {
        AddForceD(aRB, aRB.rotation * aForce, aMode);
    }
    public static void AddForceD(this Rigidbody aRB, float x, float y, float z, ForceMode aMode = ForceMode.Force)
    {
        AddForceD(aRB, new Vector3(x,y,z), aMode);
    }
    public static void AddRelativeForceD(this Rigidbody aRB, float x, float y, float z, ForceMode aMode = ForceMode.Force)
    {
        AddRelativeForceD(aRB, new Vector3(x, y, z), aMode);
    }
}