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(I) An 85 -kg football player traveling 5.0 $\mathrm{m} / \mathrm{s}$ is stopped in1.0 $\mathrm{s}$ by a tackler. (a) What is the original kinetic energy ofthe player? $(b)$ What average power is required to stop him?

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A) 1100$J$B) 1100$W$

Physics 101 Mechanics

Chapter 8

Conservation of Energy

Work

Kinetic Energy

Potential Energy

Energy Conservation

Moment, Impulse, and Collisions

University of Michigan - Ann Arbor

University of Washington

Simon Fraser University

McMaster University

Lectures

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

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.

02:06

(I) An 85-kg football play…

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'100.0-kg football pl…

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In a game of American foot…

04:32

One 110-kg football linema…

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One 110 -kg football linem…

02:40

One $110-\mathrm{kg}$ foot…

What is the kinetic energy…

02:03

A $0.500-\mathrm{kg}$ foot…

00:47

A runner whose mass is 60 …

21:04

$\mathrm{A} 95 \mathrm{kg}…

08:31

In an American football ga…

02:13

A 0.145-kg baseball is mov…

04:43

One $110 \mathrm{~kg}$ foo…

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(II) A $95-\mathrm{kg}$ fu…

kinetic energy eyes given by 1/2 mass times the initial velocity squared. So this is simply 1/2 times 85 kilograms times Ah, five meters per second already squared. So you got about 1063 triples in part B. You want to find the power power? Is this energy over time? That's average power. Ah, and so this is just kinetic energy over time. So 10 63 jewels over one second and the jewel per second is a want. So this is 10 63 watts, and that's it.

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