Что можно сказать о природе сил, возникающих при взаимодействии двух тел?

Why Hares Have Got  Long Ears.         Brother Hare goes to  Aunt Mammy- Bammy. He is happy. He has got the Bird in the box. "Hello, Aunt Mammy- Bammy! " he says. "Here is the Bird for you." And he gives the Bird to his Aunt . Aunt Mammy- Bammy takes the Bird and says : What a nice Bird you've got . You are clever , but not very clever . If you want to be very clever , get the Snaks tooth for me . Do you want to be  very, clever? "OH, yes. of course,I do!"  says Brother Hare. "I can get it !"  Brother Hare takes some gum and makes a toy bird out of the gum. Then he takes the toy bird and goes to the lake  where the Snake lives. The Snake is hungry. Suddenly she sees the bird . She wants to eat it. The Snake takes the toy bird into her mouth. But now... Whats the matter? She cant close her mouth! Its awful! Brother Hare runs up to her and gets the Snakes tooth out of her mother . Oh , its great ! I*ve  got  it . And he ran to Aunt Mammy- Bammy.