Chap8Add - Chapter 6 Additional Notes In class we defined...

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Chapter 6 Additional Notes In class we defined that impulse is give by I = F Δ t = Δ p In the absence of an exterior force, this can be written as I = 0 = Δ p Therefore we have 0 = Δ p = p ' p The prime denotes final.
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Hence we can write p ' = p This is known as conservation of momentum . So, in the absence of exterior forces, the final momentum of the system is equal to the initial momentum of the system.
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Notes Example 1: To do this problem we first note that we will split the problem up into two separate pieces. When the bullet first strikes the block this is a completely inelastic collision, meaning that energy is not conserved but momentum is conserved. So the first part will be to look at the conservation of momentum. After the collision, however, there is no friction or air resistance. This means that we can use conservation of energy since initially the bullet-block system has kinetic energy then afterward has all potential energy. This is the second stage.
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Initially, the bullet is the only object with momentum since it is the only object moving. Afterward the bullet and block stick together and have momentum.
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This note was uploaded on 01/02/2010 for the course PHY 101 taught by Professor Pralle during the Fall '08 term at SUNY Buffalo.

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Chap8Add - Chapter 6 Additional Notes In class we defined...

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