根据短文内容，选择最佳答案。
A well-dressed man goes into a restaurant one day. He sits down at a table near the window. A waiter comes up to him and says, “Can I help you, sir?”
The man says, “Can I see the menu?” “Certainly.”
The man wants a good meal and he wants a lot of nice dishes. The waiter gets them for him. The man is having his meals. At this time, a boy comes in and sits beside the man. He asks the man to give him an ice cream. The man does so.
Now the boy is eating his ice cream. The man says, “I go out for a newspaper.” The man goes out. After the boy eats his ice cream up, he stands up and goes to the door.
“Excuse me. Your father doesn't give the money for the meal and your ice cream,” The waiter stops him and says.
“Father? You are wrong. He isn't my father. I don't know him. I meet him in the street. He says he will give me an ice cream if I come here at 12 o'clock.”
关于接触处的弹力和摩擦力，以下说法正确的是（ ）
