A child received a toy train set that moves on a flat track. The child pushed and released the train to move down the tracks, and the train eventually slowed. What is the force responsible for the train slowing to a stop?

A child received a toy train set that moves on a flat track. The child pushed and released the train to move down the tracks, and the train eventually slowed.  The force responsible for the train slowing to a stop was :

Friction

Explanation:

Friction is the resistance of motion when one object rubs against another. Anytime two objects rub against each other, they cause friction. Friction works against the motion and acts in the opposite direction. When one object is sliding on another it starts to slow down due to friction.Friction is the force that opposes the relative motion between the two surfaces of objects in contact. The force of friction always acts in the direction opposite to that of the applied force. Since friction is a type of force, it is measured in Newton (N).Friction is responsible for many types of motion. It helps us walk on the ground. Brakes in a car make use of friction to stop the car. Asteroids are burnt in the atmosphere before reaching Earth due to friction. It helps in the generation of heat when we rub our hands.Friction is used in car brakes, when we walk or climb a hill, making a fire, skiing down a hill, and more. Different types of surfaces create different amounts of friction.