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Newton's First Law of Motion says "An object that is at rest will stay at rest unless an unbalanced force acts upon it. An object that is in motion will not change its velocity unless an unbalanced force acts upon it." Another way to say it: "The first law law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Velocity is both the object's speed and the direction of its motion."
Introduction to newton's first law of motion. Inertial frames of reference.
This is a variation of the classic pulling out the table cloth experiment. The pen cap can be substituted for anything small enough to fit inside of the bott...
Physics Assignment
I discovered that a large ball bearing will spin for a unexpectingly LONG time when placed in a glass bowl. I was able to get one spinning for over 2 minutes...
