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# hmwk3 - Week 3 Homework Due April 21 1 The textbook...

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Week 3 Homework Due April 21. 1. The textbook says “this process of adding the mass of a large body to the mass of a smaller one is very important in many sports...” What example does the textbook use to illustrate this principle? Give an example from another sport where this principle applies. 2. In response to the warmup question, “In karate, how do you break a board without getting hurt?” one student wrote: In karate, the force exerted upon the board is very large. Also, the person doesn’t follow through as a boxer would, rather they withdraw their punch moments after it touches the board, which exerts maximum force on the board, and minimum force on the hand. (a) Which part(s) of the student’s statement is correct? Explain. (b) Which part(s) of the student’s statement is wrong? Explain. 3. In lecture, Professor Heidbrink explained that stress σ is σ = F / A = m Δ v / ( A Δ t ) , (1) where m is the mass of the object that is accelerating, Δ v is the change in velocity of the object, A

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hmwk3 - Week 3 Homework Due April 21 1 The textbook...

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