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Unformatted text preview: HY101: The power of conservation laws: Momentum! http://johnfenzel.typepad.com/john fenzels blog/images/2007/03/29/safety net cartoon.jp What is momentum? Start with Newton’s third law: ~ F 21 = ~ F 12 . Multiplying Newton’s third law by Δ t and using Newton’s second law gives us ~ F 21 Δ t = ~ F 12 Δ t = m 2 Δ ~ v 2 = m 1 Δ ~ v 1 . If we define momentum ~ p = m~ v , then we have Δ ~ p 2 = Δ ~ p 1 . Note that momentum is a vector. Momentum problem A 2.0 kg block is moving to the right at 1.0 m/s just before it strikes and sticks to a 1.0 kg block initially at rest. What is the total momemtum of the two blocks after the collision? Momentum problem A 2.0 kg block is moving to the right at 1.0 m/s just before it strikes and sticks to a 1.0 kg block initially at rest. What is the total momemtum of the two blocks after the collision? Answer: 2.0 kg m/s to the right. Impulsemomentum theorem The product of ~ F Δ t is known as impulse. Assuming the forces acting on an object are constant, Δ ~ p = X ~ F Δ t ....
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This note was uploaded on 05/18/2008 for the course PHY 101 taught by Professor Schwarz during the Fall '08 term at Syracuse.
 Fall '08
 Schwarz
 Momentum, Power

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