Question

when an object moves, stops moving, changes speed, or changes direction, how do scientists describe that condition?
stable factors
frictional force
a balanced set of forces
unbalanced forces

Explanation:

To solve this, we analyze each option:

• "stable factors" is not a term related to describing motion changes.
• "frictional force" is a type of force, not the general term for motion changes.
• "a balanced set of forces" results in no change in motion (object remains at rest or moves at constant velocity).
• "unbalanced forces" cause a change in motion (like starting, stopping, speeding up, slowing down, or changing direction), which matches the described conditions.

Answer:

D. unbalanced forces