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At a classic auto show, a $840-\mathrm{kg}$ 1955 Nash Metropolitan motors by at 9.0 $\mathrm{m} / \mathrm{s}$ , followed by a $1620-\mathrm{kg} 1957$ Packard Clipper purring past at 5.0 $\mathrm{m} / \mathrm{s}$ , (a) Which car has the greater kinetic energy? What is the ratio of the kinetic energy of the Nash to that of the Packard? (b) Which car has the greater magnitude of momentum? What is the ratio of the magnitude of momentum of the Nash to that of the Packard? (c) Let $F_{N}$ be the net force required to stop the Nash in time $t$ , and let $F_{\mathrm{p}}$ be the net force required to stop the Packard in the same time. Which is larger: $F_{\mathrm{N}}$ or $F_{\mathrm{P}}$ ? What is the ratio $F_{\mathrm{N}} / F_{\mathrm{p}}$ of these two forces? (d) Now let $F_{\mathrm{N}}$ be the net force required to stop the Nash in a distance $d$ , and let $F_{\mathrm{p}}$ be the net force required to stop the Packard in the same distance. Which islarger. $F_{\mathrm{N}}$ or $F_{\mathrm{P}}$ ? What is the ratio $F_{\mathrm{N}} / F_{\mathrm{P}} ?$

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(a) $\frac{K_{\mathrm{v}}}{K_{\mathrm{p}}}=1.68$(b) $\frac{p_{\mathrm{N}}}{p_{\mathrm{p}}}=0.933$(c) $\frac{F_{\mathrm{N}}}{F_{\mathrm{p}}}=\frac{p_{\mathrm{N}}}{p_{\mathrm{p}}}=0.933$(d) $\frac{F_{\mathrm{N}}}{F_{\mathrm{p}}}=\frac{K_{\mathrm{N}}}{K_{\mathrm{p}}}=1.68$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

Simon Fraser University

University of Winnipeg

McMaster University

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

11:09

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01:51

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23:35

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09:10

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04:06

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01:45

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02:14

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01:46

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06:21

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