Newton's First Law: If the Resultant Force on a stationary object is zero, the object will remain stationary. If the Resultant Force on a moving object is zero, it will just carry on moving at the same Velocity.
For example, if a stationary Car had a Resultant Force of 0, the Car would not move anywhere so, therefore, staying stationary however if a moving car had a Resultant Force of 0, the car would just remain travelling at the same Speed and Direction otherwise known as Velocity.
When an object is travelling at Constant Velocity it means the Resistive and Driving Forces must all be balanced with each other since Velocity will only change if there is a Resultant Force acting on the object.
A Resultant Force will always produce Acceleration or Deceleration in the direction of the force and this Acceleration can take 5 different forms: Starting, Stopping, Speeding Up, Slowing Down and Changing Direction. On a free body diagram, this would be represented through unequal arrows.
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