Answer: what it basically states is than an object in motion will stay in motion until something stops it, whether that be the wind slowing it down, friction, a person, or a wall. For example - when you throw a ball, several forces are acting on it that stop it from going forever. Gravity is pulling the ball back to the ground and the wind/ air is pushing against it as well. Thats why if you throw a ball in space it will continue going forever since gravity and air arent acting on it .
