Newton's first law is inertia. Now, what is inertia? Well, according to Newton's First Law, an object at rest tends to stay at rest unless acted upon by an outside, unbalanced force. For example, if there is an object resting on a table top and there is a sheet of paper pulled out from under it, the object will stay in the position it is in unless unbalanced forced is applied to it. The picture above is a prime example of this, the checker sitting on top of the wooden hoop fell straight into the jar. Now why is that? Well, because there was no force being exerted onto the checker piece, it fell into the jar when the hoop was moved. If you had used the hoop to make the checker unbalanced then it probably wouldn't go into the jar.
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