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 masses. Here, the tree and the plane have mass.

Step2: Identify direction of gravitational force

The gravitational force between the tree and the plane acts along the line joining their centers of mass, which is a vertical - like direction (towards the center of the Earth for both objects). It is an attractive force.

Answer:

The second option (the one with vertical - like arrows pointing towards each other)