Collisions and Explosions
Dec. 14, 2002

I. 2-D Collisions/Explosions - (No outside force)

Engage:

• Demo: Different mass carts colliding
  
• Demo: Fuji rocket
  
• Demo: throw ball while on roller blades

Explore: What is conserved - mass? velocity? momentum? kinetic energy?

• Set up Excel sheet. Right-click to download Excel sheet for m1, m2, v1,v2,v1', v2', Sv, Sv', Sp, Sp', SKE, SKE'.
  
• For those new to Excel.
  
• Move through several stations:
  air tracks, old carts, Interactive Physics, web simulations, air pucks, straws & marbles & rubber band.

Explain: Use white boards to summarize
Define conservations.

Apply: Groups present everyday examples, such as gun and bullet, etc.

• Advanced: find equations for astro-blaster.
  
• Advanced: what else beside momentum is needed for Newton's balls?
  
• Advanced: sailboat

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II. 3-D Collisions/Explosions - (No outside force)

Engage:

• Pool balls
  
• "Kick Dis"

Explore: Add vectors on white boards.
Explain: 3-D vector addition
Help with adding vectors

Apply: Find mass of top quark from conservation of momentum

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III. Force Causing Change in Momentum: Impulse = F t = m Dv

Engage: Rolling with the punch, catching ball, jumping . . .

Explain: (white boards) Get from Newton's second law to impulse changing momentum.

Apply:
1. Examples of increasing t to decrease F, where Dp is constant.

• egg thrown into sheet
  
• sad and happy ball darts
  
• etc.

2. Examples of increasing t to increase p, where F is constant.

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IV. Angular Momentum ??(if time or for advanced)

Engage: spinning on stool

Explore: Where mass is located, is important: rotational inertia = I = _m r²

Explain: m R² v = m R ²v

Apply: (white boards) examples.

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