[超初心者向け]Unityチュートリアル「はじめてのUnity」のブロック崩しと同等をC#で::(4)ラケットを動かす ref: http://qiita.com/JunShimura/items/5fac20966bba6b223427

Racket.cs

using UnityEngine;
using System.Collections;

public class Racket : MonoBehaviour {

    private float accel = 1000.0f;//加える力の大きさ

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {
        //力を加える
        this.GetComponent<Rigidbody>().AddForce(
            transform.right*Input.GetAxisRaw("Horizontal")*accel,
            ForceMode.Impulse);
    }
}