Physics I For Dummies by Steven Holzner

Physics I For Dummies by Steven Holzner

Author:Steven Holzner [Holzner, Stephen]
Language: eng
Format: epub
ISBN: 9781119872245
Publisher: Wiley
Published: 2022-03-12T00:00:00+00:00


Plugging in the numbers gives you

Because the horse does this work in 2.0 seconds, the power needed is

One horsepower is 745.7 watts, so the horse is giving you about one-half horsepower — not too bad for a one-horse open sleigh.

Doing alternate calculations of power

Because work equals force times distance, you can write the equation for power the following way, assuming that the force acts along the direction of travel:

where s is the distance traveled. However, the object’s speed, v, is just s divided by t, so the equation breaks down to



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