Inertia

Newton’s First Law of Motion: An object at rest remains at rest, and an object in motion stays in motion at a constant speed and in a straight line unless acted on by an unbalanced force"

This property of resistance to change in motion is called INERTIA. In order to demonstrate inertia, students conducted an experiment using a jar, pennies, and an index card. The coin wants to remain at rest because it has inertia. If you try to slowly pull the card away, you can not overcome that force and the coin will remain on the card. If you pull the card away quickly, the coin will stay in one place for a split nanosecond before gravity takes over and the coin falls into the cup.