''Free Body Diagrams''

http://www.meritnation.com/ask-answer/question/what-is-gravitation/science/6909794
One object is moving its the apple it is being pulled down by gravity to the ground.
One force is Gravitational Force as you can see the apple from the apple tree is being pulled down.
Another force is the earth's surface pushing up against the woman you see in the picture it's called Normal Force.