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? __________ 4 is the soccer ball sitting on the grass balanced or unbalanced? __________ 5 what would cause a change in the soccer balls state of rest? ____________

Explanation:

1. At the top of the hill, the roller - coaster is unbalanced because gravity acts on it and there is a potential for it to start moving down the slope.
2. Gravity and the shape of the track cause the roller - coaster to change its motion. Gravity pulls it down slopes and the track guides its path.
3. The soccer ball sitting on the grass is balanced. The force of gravity pulling it down is balanced by the normal force exerted by the grass pushing it up.
4. An external force such as a kick from a player or wind would cause a change in the soccer ball's state of rest.

Answer:

1. Unbalanced
2. Gravity and track shape
3. Balanced
4. An external force (e.g., a kick, wind)