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The Problem
Three m masses are placed in the corners of an equilateral
triangle having a side length of L. The rods that connect the
triangle corners are massless and the triangle is placed in rest
on a horizontal frictionless table. A bullet with mass m is
moving in a speed V​0​in the positive X axis direction and hits
the upper mass of the triangle, as seen in the drawing. After
the collision the bullet is moving in a velocity of V= -0.2V​0​x.
What is the velocity of the center of mass of the triangle after the collision.
What is the final angular velocity of the triangle relative to the triangle’s center of
mass.
Qualitative Analysis
● Three masses are placed in the corners of an equilateral triangle.
● A bullet moving in the positive X direction hits the upper mass and continues moving.
Quantitative Analysis
● The mass of each mass and the bullet is m.
● The speed of the bullet before collision is V​0​(V​B​).
● The speed of the bullet after collision is -0.2V​0​(U​B​).
Requirements Analysis
● The velocity of the center of mass of the Triangle after collision (UT).
● The angular speed of the triangle relative to its center of mass after collision (ω).
Physics Problem Solving
https://youtu.be/DKQf8b-T_2w
 
Solution for U​T
 
 
 
 
 
 
 
 
 
 
 
    V U m Um  B = m  B + 3   T  
  − .2V ) UV 0 = ( 0 0 + 3 T  
   (1.2V ) .4VUT = 3
1
0 = 0 0    
 ​The velocity of the center of mass of the triangle after collision is .4V  0 0
Physics Problem Solving
https://youtu.be/DKQf8b-T_2w
 
Solution for ​ω
1  = Iω  LT        
2  m rI = Σ i i
2
 
   
3   r = L
2cos30    
4   LT +  LB2 = LB1    
5  mU  LB2 = r B    
6   LB1 = mV  r 0    
4  r(V )  LT = LB1 − LB2 = m 0 − UB =    
       .2V m  = 1 0
L
2cos30 = √3
1.2mLV 0
   
2  (m( ) ) L  I = 3 L
2cos30
2
= m 2
   
1  L ω√3
1.2mLV 0
= m 2
   
1   ω = L√3
1.2V 0
   
The angular speed of the triangle is L√3
1.2V 0
Physics Problem Solving
https://youtu.be/DKQf8b-T_2w
 

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Rigid object problem

  • 1. The Problem Three m masses are placed in the corners of an equilateral triangle having a side length of L. The rods that connect the triangle corners are massless and the triangle is placed in rest on a horizontal frictionless table. A bullet with mass m is moving in a speed V​0​in the positive X axis direction and hits the upper mass of the triangle, as seen in the drawing. After the collision the bullet is moving in a velocity of V= -0.2V​0​x. What is the velocity of the center of mass of the triangle after the collision. What is the final angular velocity of the triangle relative to the triangle’s center of mass. Qualitative Analysis ● Three masses are placed in the corners of an equilateral triangle. ● A bullet moving in the positive X direction hits the upper mass and continues moving. Quantitative Analysis ● The mass of each mass and the bullet is m. ● The speed of the bullet before collision is V​0​(V​B​). ● The speed of the bullet after collision is -0.2V​0​(U​B​). Requirements Analysis ● The velocity of the center of mass of the Triangle after collision (UT). ● The angular speed of the triangle relative to its center of mass after collision (ω). Physics Problem Solving https://youtu.be/DKQf8b-T_2w  
  • 2. Solution for U​T                           V U m Um  B = m  B + 3   T     − .2V ) UV 0 = ( 0 0 + 3 T      (1.2V ) .4VUT = 3 1 0 = 0 0      ​The velocity of the center of mass of the triangle after collision is .4V  0 0 Physics Problem Solving https://youtu.be/DKQf8b-T_2w  
  • 3. Solution for ​ω 1  = Iω  LT         2  m rI = Σ i i 2       3   r = L 2cos30     4   LT +  LB2 = LB1     5  mU  LB2 = r B     6   LB1 = mV  r 0     4  r(V )  LT = LB1 − LB2 = m 0 − UB =            .2V m  = 1 0 L 2cos30 = √3 1.2mLV 0     2  (m( ) ) L  I = 3 L 2cos30 2 = m 2     1  L ω√3 1.2mLV 0 = m 2     1   ω = L√3 1.2V 0     The angular speed of the triangle is L√3 1.2V 0 Physics Problem Solving https://youtu.be/DKQf8b-T_2w