Okay, so please help settle a dispute. A toy car is moving at a constant speed of 1 m/s. The car is powered by a battery. Now, when the car is going at a constant speed, there is obviously no net force on the car. The dispute comes when trying to draw a FBD. Is there friction (traction) between the ground and the wheels? If so, what force is balancing out the traction to keep the car from accelerating? At that speed, air resistance is negligible, correct? If not, then why will the car only move when powered on? As soon as power stops, the car decelerates which indicates where was a negative force on the car being countered by traction.