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--- 183_notes:examples:netforce [2014/07/10 17:06] – [Solution] caballero
+++ 183_notes:examples:netforce [2017/12/05 02:48] (current) – pwirving
@@ Line 2: / Line 2: @@
 ====== Example: Calculating the net force ======
-The fan cart in the video below is observed to experience a net force to the right. Determine the (vector) net force acting on the fan cart.
+The fan cart is observed to experience a net force to the right.
+Determine the (vector) net force acting on the fan cart.
 ==== Setup ====
@@ Line 44: / Line 45: @@
 So, we can now compute the net force,
-$$\vec{F}_{net} = \sum \vec{F}_i  = \vec{F}_fan + \vec{F}_{Earth} + \vec{F}_{track} = \langle 0.45, 0, 0 \rangle N + \langle 0, -2.94, 0 \rangle + \langle 0, 2.94, 0 \rangle = \langle 0.45, 0, 0 \rangle N$$
+$$\vec{F}_{net} = \sum \vec{F}_i  = \vec{F}_{fan} + \vec{F}_{Earth} + \vec{F}_{track} = \langle 0.45, 0, 0 \rangle N + \langle 0, -2.94, 0 \rangle + \langle 0, 2.94, 0 \rangle = \langle 0.45, 0, 0 \rangle N$$
+Notice this is simply the force that the air exerts on the blades. This is the force responsible for the momentum change of the fan cart.