According to Newton's first law...
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues to stay in motion with the same speed and in the exact same direction unless acted upon by an "unnatural" force. This law is called
"The Law of Inertia".
Real life example of Newton's first law. Usually when I'm riding the school bus in the morning, the bus is in motion, but at a stop my body still wants to stay in motion and "leans" forward to a second or two... Basically I go through the law of inertia every morning.