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You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. A friend throws you a $0.400-\mathrm{kg}$ ball that istraveling horizontally at 10.0 $\mathrm{m} / \mathrm{s}$ . Your mass is 70.0 $\mathrm{kg}$ . (a) If you catch the ball, with what speed do you and the ball move after-ward? (b) If the ball hits you and bounces off your chest, so after-ward it is moving horizontally at 8.0 $\mathrm{m} / \mathrm{s}$ in the opposite direction, what is your speed after the collision?

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(a) $0.0568 \mathrm{m} / \mathrm{s}$(b) $0.103 \mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Cornell University

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

Hope College

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.

06:57

You are standing on a shee…

08:10

14:14

02:48

01:15

03:24

03:26

$\cdot$ You are standing o…

03:37

02:37

An ice hockey forward with…

06:14

A hockey puck with mass 0.…

06:19

On a frictionless, horizon…

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