Physics for IGCSE & O level - Forces And Motion (Section 6 - No. 44)
What must happen for an object to accelerate?
The object must have a constant speed.
The object must have no forces acting on it.
A net force must act on the object.
The object must be at rest.
הֶסבֵּר
Acceleration occurs when there's a net (unbalanced) force.