Final answer:
A moving object does not travel at the same speed forever due to friction, which converts kinetic energy into heat and causes the object to slow down and eventually stop.
Step-by-step explanation:
A moving object does not travel at the same speed forever because of the presence of friction. Friction is the force that opposes the motion of an object when it comes into contact with another object or surface. As the moving object interacts with its surroundings, friction causes a loss of kinetic energy, which is converted into heat. This loss of kinetic energy gradually slows down the object until it eventually comes to a stop.
Learn more about Friction and the loss of kinetic energy in moving objects