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A $15.0-\mathrm{kg}$ fish swimming at 1.10 $\mathrm{m} / \mathrm{s}$ suddenly gobbles up a $4.50-\mathrm{kg}$ fish that is initially stationary. Neglect any drag effects of the water. (a) Find the speed of the large fish just after it eats the small one. (b) How much mechanical energy was dissipated duringthis meal?

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(a) $v_{2}=0.846 \mathrm{m} / \mathrm{s}$(b) $-2.10 \mathrm{J}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Simon Fraser University

University of Sheffield

University of Winnipeg

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.

03:50

A 15.0-kg fish swimming at…

02:49

A $15.0 \mathrm{~kg}$ fish…

02:54

A $16.0 \mathrm{~kg}$ fish…

01:51

A large fish has a mass of…

05:39

A hungry $11.5 \mathrm{~kg…

05:23

$\bullet$ A hungry 11.5 $\…

01:04

A 5 -kg fish swimming at 1…

01:22

Energy Expended by a Fish …

03:00

Suppose an Olympic diver w…

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