This is one definition of acceleration (including deceleration) - any change in the speed of motion of a moving object, or in the direction of its motion. Motion is a vector value with both speed and direction.
An unbalanced force
Move (or change direction/speed if it was already moving).
An unbalanced force can: change the speed an object moves at change the direction an object is moving cause an object to start/stop moving
That's 'acceleration'.
The speed of the object will increase.
Speed or direction or both.
It can change its speed or direction.
The object will maintain its speed and direction or the object will not change its speed or direction.
An unbalanced force
yes
Move (or change direction/speed if it was already moving).
An unbalanced force can: change the speed an object moves at change the direction an object is moving cause an object to start/stop moving
That's 'acceleration'.
The speed of the object will increase.
When a moving object is pushed in the direction of its motion the speed of the object increases
When a moving object is pushed in the direction of its motion the speed of the object increases
Balanced forces will not change the velocity - speed and direction - of a moving object. the object will continue to move in the same way.