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On a very muddy football field, a $110-\mathrm{kg}$ linebacker tackles an $85-\mathrm{kg}$ halfback. Immediately before the collision, the line-backer is slipping with a velocity of 8.8 $\mathrm{m} / \mathrm{s}$ north and the halfback is sliding with a velocity of 7.2 $\mathrm{m} / \mathrm{s}$ east. What is the velocity (magnitude and direction) at which the two players move together immediately after the collision?

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$v_{2}=5.87 \mathrm{m} / \mathrm{s}, 57.7^{\circ}$ north of east

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

Simon Fraser University

University of Sheffield

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.

06:40

On a very muddy football f…

01:40

04:21

$\bullet$ On a very muddy …

04:53

02:25

(II) A $95 .$ kg halfback …

08:30

An 88 kg fullback moving e…

08:22

06:53

Attempting to score a touc…

04:27

(I) A 110-kg tackler movin…

03:54

A 92 -kg fullback, running…

01:52

(I) A 130 -kg tackler movi…

01:15

Two football players colli…

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