Question

2 is the roller coaster at the top of the hill balanced or unbalanced? 3 what would cause the roller coaster to change its motion?

Explanation:

At the top of the hill, the roller - coaster is unbalanced as there is a net force acting on it due to gravity and the track's curvature. Gravity and the normal force from the track are not in perfect equilibrium. A change in motion is caused by unbalanced forces. Gravity pulling it down the slope and friction between the coaster and the track (which can either slow it down or affect its path) are the main factors. Also, the shape of the track which guides the coaster and can accelerate or decelerate it.

Answer:

1. Unbalanced
2. Unbalanced forces such as gravity, friction, and the shape of the track.