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At one instant, the center of mass of a system of two particles is located on the $x$ -axis at $x=2.0 \mathrm{m}$ and has a velocity of $(5.0 \mathrm{m} / \mathrm{s})$ ) One of the particles is at the origin. The other particle has a mass of 0.10 $\mathrm{kg}$ and is at rest on the $x$ -axis at $x=8.0 \mathrm{m}$ . (a) What is the mass of the particle at the origin? (b) Calculate the total momentum of this system. (c) What is the velocity of the particle at the origin?

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(a) $m_{1}=0.30 \mathrm{kg}$(b) $\overrightarrow{\mathrm{p}}_{\text {tot}}=2.0 \hat{\mathrm{i}} \quad \mathrm{kg} \cdot \mathrm{m} / \mathrm{s}$(c) $\overrightarrow{\mathrm{v}}_{1}=6.67 \hat{\mathrm{i}} \mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

University of Washington

Simon Fraser University

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.

18:22

At one instant, the center…

02:53

A particle of mass $2.0 \m…

04:29

At a certain instant, four…

06:24

At time $t=0$, a $2.0 \mat…

06:42

A system consists of two p…

02:20

A particle of mass 5.0 kg …

03:17

03:29

01:22

A 0.2-kg particle is trave…

05:40

At time $t=0,$ force $\vec…

13:08

Particle 1 with mass $m$ a…

01:23

A particle has mass 0.5 kg…

01:40

A particle of mass 4.0 kg …

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