Dodge - cool down

Hi, I have made a script of player movement. I just need to make my player dodge the enemy i hit wsad+space and he dodge in the direction of the button. I just need to cool down the player. Now its looks like a teleportation. Any idea?

 if(Input.GetAxis("Vertical") > 0 && Input.GetButtonDown("Strafe"))
             {
                 rigidbody.AddForce (Camera.main.transform.forward * 7500);
             }