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| 183_notes:freebodydiagrams [2021/03/13 18:52] – [The Point Particle and the Free-Body Diagram] stumptyl | 183_notes:freebodydiagrams [2021/03/13 18:53] (current) – [Ball lowered down; speed decreasing] stumptyl | ||
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| Consider a ball hanging from a wire attached to the ceiling. The forces acting on the system consisting of the ball are due to the Earth ($\vec{F}_{Earth}$) and the wire ($\vec{F}_{wire}$). The ball experiences no motion ($\Delta \vec{p}_{ball} = 0$) //and thus the net force acting on the ball is zero.// Hence, the two forces acting on the ball (due to different objects) are the same magnitude, but point in opposite directions. To be clear, [[183_notes: | Consider a ball hanging from a wire attached to the ceiling. The forces acting on the system consisting of the ball are due to the Earth ($\vec{F}_{Earth}$) and the wire ($\vec{F}_{wire}$). The ball experiences no motion ($\Delta \vec{p}_{ball} = 0$) //and thus the net force acting on the ball is zero.// Hence, the two forces acting on the ball (due to different objects) are the same magnitude, but point in opposite directions. To be clear, [[183_notes: | ||
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| The above free-body diagram is the same for a a ball being lowered or raised at //constant speed.// Can you see why? | The above free-body diagram is the same for a a ball being lowered or raised at //constant speed.// Can you see why? | ||
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