Physicists create fluid with ‘negative mass’

Assessment 6: Newton’s Laws

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Physicists at Washington State University have managed to make a fluid that doesn’t follow Newton’s Second Law of Motion. It has “negative mass,” meaning when the liquid is pushed it accelerates backwards. The liquid is made up of rubidium atoms cooled, with lasers, to slightly above absolute zero. The article from United Press International says that the success of the experiment could”[A]llow for exploration of strange phenomena like black holes and neutron stars.”

Newton’s second law states that when a force acts on an object, the object will accelerate in the direction of that force. As we learned from a class lecture, the equation for Newton’s second law is: ΣF (net force)= Mass x acceleration.

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Thinking back to Assessment 6, Newton’s Laws, I can say I will miss this conceptual objective until the day I die. People always talk about Newton’s Laws, but I never could remember what they were. Newton’s first law, or the law of inertia, states that an object will stay at rest or in motion in the same direction and speed unless acted on by an outside force. The second law, as I previously stated, says that when a force acts on an object, the object will accelerate in the direction of that force. The third law states that for every force there is a reaction force that is equal, but in the opposite direction. Well thanks to this conceptual objective, I know I will not be left in the dark when Newton’s laws are brought up in conversation, as this happens quite often.

Author: jakek

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