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A steel ball with mass 40.0 $\mathrm{g}$ is dropped from a height of 2.00 $\mathrm{m}$ onto a horizontal steel slab. The ball rebounds to a height of 1.60 $\mathrm{m}$ . (a) Calculate the impulse delivered to the ball during impact. (b) If the ball is in contact with the slab for 2.00 $\mathrm{ms}$ , findthe average force on the ball during impact.

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(a) $J=0.474 \mathrm{kg} \cdot \mathrm{m} / \mathrm{s}$ upward(b) $F=237 \mathrm{N}$ upward

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Cornell University

Hope College

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.

03:45

A steel ball with mass 40.…

03:24

$\bullet$ A steel ball wit…

02:20

A steel ball with mass $40…

07:06

A steel ball with a mass o…

04:39

A ball of mass $0.500 \mat…

02:49

A force that averages $984…

14:30

A steel ball is dropped on…

A ball of mass $200 \mathr…

01:26

A $1.2 \mathrm{~kg}$ ball …

03:47

A rubber ball (mass 0.25 k…

02:53

A 0.550 kg ball falls dire…

02:16

A force magnitude that ave…

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