Question

= net force = forces added
100 n - 60 n - 40 n = 0 n
forces are balanced!
multiple - choice question
when does motion occur (in the case of
when net forces are balanced.
when net forces are unbalanced.
rewatch

Explanation:

According to Newton's first law of motion, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. When net forces are balanced ($F_{net}=0$), the object's state of motion (whether at rest or moving at a constant velocity) remains unchanged. When net forces are unbalanced ($F_{net}
eq0$), the object's velocity changes (it accelerates or decelerates), which means motion (in terms of a change in velocity) occurs.

Answer:

When net forces are unbalanced.