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If you have no way to avoid the punch, choice (1) is obviously better. But why? Let's look at the answer in terms of the impulse-momentum theorem, from the point of view of the hand. Q3: The change in momentum (mAv) of the hand is the same in (1) and (2) shown above. Carefully explain why. Now, since mAi for the hand is the same in both cases, and since mav = FAt, then FAt is the same in (1) and (2) for the hand. Thus, a small force acting over a large time period is equal to a large force acting over a small time period. This is shown in the previous picture with the size of %3D the letters

If you have no way to avoid the punch, choice (1) is obviously better. But why? Let's look at the answer in terms of the impulse-momentum theorem, from the point of view of the hand. Q3: The change in momentum (mAv) of the hand is the same in (1) and (2) shown above. Carefully explain why. Now, since mAi for the hand is the same in both cases, and since mav = FAt, then FAt is the same in (1) and (2) for the hand. Thus, a small force acting over a large time period is equal to a large force acting over a small time period. This is shown in the previous picture with the size of %3D the letters

Physics for Scientists and Engineers, Technology Update (No access codes included)
Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter9: Linear Momentum And Collisions
Section: Chapter Questions
Problem 9.9P: In research in cardiology and exercise physiology, it is often important to know the mass of blood...
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Impulse and Momentum (1) go with the punch (2) stiff-necked FAt= F A = mai If you have no way to avoid the punch, choice (1) is obviously better. But why? Let's look at the answer in terms of the impulse-momentum theorem, from the point of view of the hand. Q3: The change in momentum (mAv) of the hand is the same in (1) and (2) shown above. Carefully explain why. Now, since mAi for the hand is the same in both cases, and since mab = FAt, then ÉAt is the same in (1) and (2) for the hand. Thus, a small force acting over a large time period is equal to a large force acting over a small time period. This is shown in the previous picture with the size of the letters. I Q4: In the previous paragraph, could the words "for the hand" be replaced with the words "for the face" and still be valid? Why or why not? Q5: Sketch to correct relative scale the force-time graphs associated with the two punches described above (going with the punch and stiff-necked). Remember to label your axes and insert a picture of your hand-drawn sketches below. 1.
Transcribed Image Text:Impulse and Momentum (1) go with the punch (2) stiff-necked FAt= F A = mai If you have no way to avoid the punch, choice (1) is obviously better. But why? Let's look at the answer in terms of the impulse-momentum theorem, from the point of view of the hand. Q3: The change in momentum (mAv) of the hand is the same in (1) and (2) shown above. Carefully explain why. Now, since mAi for the hand is the same in both cases, and since mab = FAt, then ÉAt is the same in (1) and (2) for the hand. Thus, a small force acting over a large time period is equal to a large force acting over a small time period. This is shown in the previous picture with the size of the letters. I Q4: In the previous paragraph, could the words "for the hand" be replaced with the words "for the face" and still be valid? Why or why not? Q5: Sketch to correct relative scale the force-time graphs associated with the two punches described above (going with the punch and stiff-necked). Remember to label your axes and insert a picture of your hand-drawn sketches below. 1.
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