Lecture20a

Lecture20a - PHYSICS 149: Lecture 20 Chapter 7: Linear...

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PHYSICS 149: Lecture 20 • Chapter 7: Linear Momentum – 7.6 Motion of the Center of Mass – 7.7 Collisions in One Dimension • Chapter 8: Torque and Angular Momentum – 8.1 Rotational Kinetic Energy and Rotational Inertia – 8.2 Torque – 8.4 Equilibrium Revisited Lecture 20 Purdue University, Physics 149 1
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Midterm Exam 2 • Wednesday, April 6, 6:30 PM – 7:30 PM • Place: PHY 333 • Chapters 5 - 8 • The exam is closed book. • The exam is a multiple-choice test. • There will be ~15 multiple-choice problems. – Each problem is worth 10 points. • Note that total possible score for the course is 1,000 points (see the course syllabus) • The difficulty level is about the same as the level of textbook problems. • You may make a single crib sheet – you may write on both sides of an 8.5” × 11.0” sheet Lecture 20 2 Purdue University, Physics 149
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Center of Mass • The center of mass serves as an “average position” of a system, if the system consists of more than just a single point object. • The center of mass can be thought of as the point where the object would balance if it were supported there. • The center of mass does not have to be within the object (e.g., a boomerang, doughnut). Lecture 20 3 Purdue University, Physics 149
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Center of Mass Å The center of mass simply follows along the trajectory of a projectile. Å The center of mass may be outside the object. Lecture 20 4 Purdue University, Physics 149
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ILQ The square below is clearly showing its center of mass at the center. Suppose the square is cut in two pieces and the pieces are rearranged as shown. The center of mass has moved a) up and to the right b) up and to the left c) up only d) down and to the left e) down and to the right Lecture 20 5 Purdue University, Physics 149
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• The disk shown below (1) clearly has its CM at the center. • Suppose the disk is cut in half and the pieces arranged as shown in (2): Where is the CM of (2) as compared to (1)? A
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Lecture20a - PHYSICS 149: Lecture 20 Chapter 7: Linear...

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