Question

a plane flies over a tree. what is the correct relationship of forces acting between the tree and the plane?

Explanation:

Step1: Recall gravitational force concept

Gravitational force acts between any two objects with mass. It acts along the line joining the centers of the two objects and is an attractive force. Here, the tree and the plane have mass. The gravitational force between them acts vertically - the plane is pulled towards the tree and the tree is pulled towards the plane along the vertical line joining their centers of mass.

Answer:

The vertical - up and vertical - down arrows (the middle option among the three shown in the image) represent the correct relationship of forces (gravitational force) acting between the tree and the plane.