# Exam 3 Advice - Dear All here are a few things to know...

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Dear All, here are a few things to know about the exam: the review problems for exam 3 were posted on BB under exams and tomorrow's recitation covers only problems for exam 3, no fluid problems in tomorrow's recitation. Here are a few tips on how to approach all problems: 1. there are only three ways to solve problems: using Newton's laws, conservation of energy or conservation of momentum. 2. If the problem asks about forces or acceleration, use Newton's law: it relates forces to accelaration. Do not forget to apply it proeprly, for translation or rotation. 3. When the system in the problem has a change in position or in velocity, use the conservation of energy: it relates the change in position (through gravitational potential energy that depends on position) to the change in velocity (through the kinetic energy that depends on velocity). Don't forget
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Unformatted text preview: that kinetic energy can be translational or rotational. Also when writing the gravitational potential energy of a rigid body, consider its mass as being concentrated in the center of mass. 4. when there is a collision or the moment of inertia of the system changes, apply the conservation of angular momentum 5. don't forget to always connect the rotational and translational motions if you have both: v=(omega)R and a=(alpha)R 6. Always figure out if you have a point particle or a rigid body, and use the proper equations. 7. Universal gravitation problems deal either with forces, or energy, or angular momentum 8. If the three laws do not work, start the problem from the definitions of quantities required. Good luck! Your instructor, Dorina Kosztin...
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• Spring '10
• Kostzin

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