Chapter 11 Notes

# Chapter 11 Notes - -Often it is not possible to calculate...

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Chapter 11: Collisions Impulsive Forces - The force that two colliding bodies exert on one another acts for only a short time, giving  a brief but strong push. Such a force that acts for only a short time is called an impulsive  force - During the collision, the impulsive force produces a large change in the motion while the  other forces produce only small and insignificant changes  - The impulse delivered by such a force to the body is defined as the integral of the force  over time:  o I = Integral from 0 to delta t of F dt - The units for impulse are the same as the units for momentum - Impulse-momentum relation - However, since the force acting during a collision is usually not known in detail, Equation  11.2 is not very helpful for calculating momentum changes - Time-average force o Average Force = Integral from 0 to delta t of F dt divided by delta t

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Unformatted text preview: -Often it is not possible to calculate the motion of the colliding bodies by direct solution of Newton’s equation of motion because the impulsive forces that act during the collision are not known in sufficient detail-A collision in which the total kinetic energy before and after the collision is the same is called elastic collisions Elastic Collisions in One Dimension-The collision of two boxcars on a railroad track is an example of a collision on a straight line-In an elastic collision of two particles moving along a straight line, the laws of conservation of momentum and energy completely determine the final velocities in terms of the initial velocities-Kinetic energy and momentum is conserved-Look at Example 4-...
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## This note was uploaded on 04/11/2008 for the course PHYS 142 taught by Professor Kolomeisky during the Spring '08 term at UVA.

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Chapter 11 Notes - -Often it is not possible to calculate...

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