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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
@@ Line 30: / Line 30: @@
 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:gravitation#newton_s_3rd_law|these forces are not Newton's 3rd Law pairs]] because they arise from different interactions the ball experiences. A free-body diagram that represents this situation is shown below.
-{{ fbds-007.png?600 }}
+{{ 183_notes:phy_freebody_1.png?600 }}
 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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-{{ fbds-008.png?600 }}
+{{ 183_notes:phy_freebody_2.png?600 }}