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You and your friends are doing physics experiments on a frozen pond that serves as a frictionless, horizontal surface. Sam, with mass 80.0 $\mathrm{kg}$ , is given a push and slides eastward. Abigail, with mass 50.0 $\mathrm{kg}$ , is sent sliding northward. They collide, and after the collision Sam is moving at $37.0^{\circ}$ north of east with a speed of 6.00 $\mathrm{m} / \mathrm{s}$ and Abigail is moving ar $23.0^{\circ}$ south of east with a speed of 9.00 $\mathrm{m} / \mathrm{s}$ . (a) What was the speed of each person before the collision? (b) By how much did the total kinetic energonof the two people decrease during the collision?

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(a) $2.26 \mathrm{m} / \mathrm{s}$(b) $-639 \mathbf{J}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

University of Michigan - Ann Arbor

University of Washington

University of Sheffield

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.

16:58

You and your friends are d…

06:13

. You and your friends are…

03:50

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Two large blocks of wood a…

05:24

Jack (mass $55.0 \mathrm{~…

07:01

Jack (mass 55.0 kg) is sli…

08:40

A $750 \mathrm{~kg}$ car i…

04:45

Two ice skaters, Daniel (m…

02:37

An ice hockey forward with…

07:41

11:28

10:41

12:28

$\bullet$ Two ice skaters,…

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