Suppose you fill up your cup with coffee, and walk a lap around the building. Your coffee would spill when:
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As you can see in the imagine below left, you can see a headphone at rest. It'll always stay in that state of motion, unless acted upon an unbalanced force. Below right is an example of an unbalanced force acting upon the headphone. The hand is the unbalanced force acting upon the heading, causing the headphone move. As you can see from your point of view, it's being pushed to the left. It'll stay in that state of motion unless acted upon an