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# L07a - Physics 111 Lecture 7a"Strength does not come from...

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1 / 9 Physics 111 Lecture 7a “Strength does not come from physical capacity. It comes from and indomitable will.” –Mahatma Gandhi

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Center of mass CM 2nd Law Momentum Question Example 2 / 9 Up until now, we have had to deal with simple objects (balls, particles, etc.) that can be treated as points Complicated objects (boomerangs, people, etc.) can have different parts moving in different directions at the same time We define a special point to deal with complicated objects, we call it the center of mass (COM, or CM) Definition: The CM of a system of particles is the point that moves as though all the mass was concentrated there and all the forces were applied there The CM of a block is the “geometrical center” of the block The CM concept will allow us to apply previous results (e.g., Newton’s Laws) to complicated objects
Center of mass CM 2nd Law Momentum Question Example 3 / 9 For discrete objects, like particles, we merely take into

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