Newton's First Law: Inertia
Now let's get this thing moving
An object at rest will stay in rest, and an object in motion will stay in motion at a constant velocity, unless an unbalanced force acts upon it.
The resistance of an object to any change in velocity
- If a car suddenly stops, the passengers will jerk forward.
- When a rollercoaster abruptly picks up speed, the riders feel pushed against their seats.