When I opened the first can of tennis balls, I immediately noticed that they were vacuumed. I threw the ball to my dog. It appeared to fly the same distance and fell at what appeared to be a normal speed. Then I wondered if people were worried about the vacuum sealing process and the aftermath that might change the outcome of a friendly tennis match. I knew I had to act quickly to calm the others. Let me try to clear up any confusion. It is generally assumed that objects in a vacuum are either weightless or have the same mass. For many years we have been told that space is a vacuum and objects in space are weightless. This can be a little confusing. Although a feather and a bowling ball fall at the same speed in a vacuum, their individual weights do not change. Only the gravitational force acts on an object in a vacuum, then it is considered to be freely falling. Newton's second law, force equals mass times acceleration (F = m * a), combined with the equation for the net force of a freely falling object (F = W), gives us the answer. Using this simple equation, a = W / m = (m * g) / m = g, it's easy to see that the acceleration of an object is equal to the acceleration of free fall! Put simply, any object, regardless of size, shape, or weight, will fall freely in a vacuum with the same acceleration. Rest assured, once a can of tennis balls is opened, gravity as we know it is fully restored and they will not be damaged. no adverse effects of the vacuum, or worse, the space-time continuum. Enjoy your new tennis balls! My dog does. Highly recommended!
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