Question

1. what evidence supports that the forces in both directions were equal? explain.

Explanation:

If an object is at rest or moving with a constant velocity (no acceleration), according to Newton's first - law (law of inertia), the net force acting on it is zero. This implies that the forces in opposite directions are equal. For example, a book resting on a table has the force of gravity pulling it down and the normal force from the table pushing it up. Since the book is at rest, these two forces are equal. Another example is an object moving at a constant speed on a frictionless surface. The forces acting on it in the horizontal direction (if any) must be balanced for it to maintain that constant speed.

Answer:

If an object is stationary or moving with a constant velocity, the forces in both directions are equal as the net force on the object is zero according to Newton's first law.