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--- 183_notes:examples:two_students_colliding [2014/10/01 05:08] – pwirving
+++ 183_notes:examples:two_students_colliding [2014/10/02 15:50] (current) – caballero
@@ Line 1: / Line 1: @@
-===== Example: Student Collision Example. =====
+===== Example: Colliding Students =====
 Two students are running to make it to class. They turn a corner and collide; coming to a complete stop. What force did they exert on each other.
@@ Line 57: / Line 57: @@
-In 1D:  $\vec{v}_{avg} = \dfrac{\Delta x}{\Delta t} = \dfrac{\vec{v}_{f} + \vec{v}_{i}}{2}$
+In 1D this looks like: $\vec{v}_{avg} = \dfrac{\Delta x}{\Delta t} = \dfrac{\vec{v}_{f} + \vec{v}_{i}}{2}$
+Relate these 3 equations together to solve for ${\Delta t}$
  ${\Delta t} = \dfrac{\Delta x}{{V}_{avg}} = \dfrac{\Delta x}{\dfrac{\vec{v}_{f} + \vec{v}_{i}}{2}}$
+Fill in the values for the variables from the assumptions and approximations you made previous.
  $\dfrac{0.025}{\dfrac{5m/s + 0m/s}{2}} = 0.01s$
+Having solved for  ${\Delta t}$  fill this value and the known value for mass and the approximated value for velocity into the equation that we arranged earlier to find  ${F}_{x,coll}$
  ${F}_{x,coll} = \dfrac{-M{V}_{ix}}{\Delta t} = - {\dfrac{(68kg)(5m/s)}{0.01s}}$